[doc]Fix string function documentation docs

docs/sql-manual/sql-functions/scalar-functions/string-functions/count_substrings.md

@@ -29,14 +29,14 @@ The COUNT_SUBSTRINGS function counts the number of occurrences of a specified su
 ## Syntax
 
 ```sql
-COUNT_SUBSTRINGS(str, pattern)
+COUNT_SUBSTRINGS(VARCHAR <str>, VARCHAR <pattern>)
 ```
 
 ## Parameters
 | Parameter | Description                             |
 | --------- | --------------------------------------- |
-| str       | The string to be searched. Type: STRING |
-| pattern   | The substring to match. Type: STRING    |
+| `<str>` | The string to be searched. Type: STRING |
+| `<pattern>` | The substring to match. Type: STRING    |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/cut-to-first-significant-subdomain.md

@@ -31,13 +31,13 @@ The CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN function extracts the effective part of a
 ## Syntax
 
 ```sql
-VARCHAR CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN(VARCHAR url)
+CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN(VARCHAR <url>)
 ```
 
 ## Parameters
 | Parameter | Description                                   |
 | --------- | --------------------------------------------- |
-| url       | The URL string to be processed. Type: VARCHAR |
+| `<url>` | The URL string to be processed. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/ltrim-in.md

@@ -33,14 +33,14 @@ The key feature of LTRIM_IN is that it removes any combination of characters fro
 ## Syntax
 
 ```sql
-VARCHAR LTRIM_IN(VARCHAR str[, VARCHAR rhs])
+LTRIM_IN(VARCHAR <str> [, VARCHAR <rhs>])
 ```
 
 ## Parameters
 | Parameter | Description                                                            |
 | --------- | ---------------------------------------------------------------------- |
-| str       | The string to be processed. Type: VARCHAR                              |
-| rhs       | Optional parameter, the set of characters to be removed. Type: VARCHAR |
+| `<str>` | The string to be processed. Type: VARCHAR                              |
+| `<rhs>` | Optional parameter, the set of characters to be removed. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/rtrim-in.md

@@ -33,14 +33,14 @@ The key feature of RTRIM_IN is that it removes any combination of characters fro
 ## Syntax
 
 ```sql
-VARCHAR RTRIM_IN(VARCHAR str[, VARCHAR rhs])
+RTRIM_IN(VARCHAR <str> [, VARCHAR <rhs>])
 ```
 
 ## Parameters
 | Parameter | Description                                                            |
 | --------- | ---------------------------------------------------------------------- |
-| str       | The string to be processed. Type: VARCHAR                              |
-| rhs       | Optional parameter, the set of characters to be removed. Type: VARCHAR |
+| `<str>` | The string to be processed. Type: VARCHAR                              |
+| `<rhs>` | Optional parameter, the set of characters to be removed. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/starts-with.md

@@ -31,14 +31,14 @@ The STARTS_WITH function checks if a string starts with a specified prefix. Retu
 ## Syntax
 
 ```sql
-BOOLEAN STARTS_WITH(VARCHAR str, VARCHAR prefix)
+STARTS_WITH(VARCHAR <str>, VARCHAR <prefix>)
 ```
 
 ## Parameters
 | Parameter | Description                               |
 | --------- | ----------------------------------------- |
-| str       | The string to check. Type: VARCHAR        |
-| prefix    | The prefix string to match. Type: VARCHAR |
+| `<str>` | The string to check. Type: VARCHAR        |
+| `<prefix>` | The prefix string to match. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/strcmp.md

@@ -31,14 +31,14 @@ The STRCMP function compares two strings lexicographically. It returns an intege
 ## Syntax
 
 ```sql
-TINYINT STRCMP(VARCHAR str0, VARCHAR str1)
+STRCMP(VARCHAR <str0>, VARCHAR <str1>)
 ```
 
 ## Parameters
 | Parameter | Description |
 | -- | -- |
-| str0 | The first string to compare. Type: VARCHAR |
-| str1 | The second string to compare. Type: VARCHAR |
+| `<str0>` | The first string to compare. Type: VARCHAR |
+| `<str1>` | The second string to compare. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/strleft.md

@@ -35,14 +35,14 @@ LEFT
 ## Syntax
 
 ```sql
-VARCHAR STRLEFT(VARCHAR str, INT len)
+STRLEFT(VARCHAR <str>, INT <len>)
 ```
 
 ## Parameters
 | Parameter | Description                                   |
 | --------- | --------------------------------------------- |
-| str       | The string to extract from. Type: VARCHAR     |
-| len       | The number of characters to return. Type: INT |
+| `<str>` | The string to extract from. Type: VARCHAR     |
+| `<len>` | The number of characters to return. Type: INT |
 
 ## Return Value
 
@@ -60,11 +60,11 @@ Special cases:
 SELECT strleft('Hello doris', 5);
 ```
 ```text
-+------------------------+
++---------------------------+
 | strleft('Hello doris', 5) |
-+------------------------+
-| Hello                  |
-+------------------------+
++---------------------------+
+| Hello                     |
++---------------------------+
 ```
 
 2. Handling negative length

docs/sql-manual/sql-functions/scalar-functions/string-functions/strright.md

@@ -36,14 +36,14 @@ RIGHT
 ## Syntax
 
 ```sql
-VARCHAR STRRIGHT(VARCHAR str, INT len)
+STRRIGHT(VARCHAR <str>, INT <len>)
 ```
 
 ## Parameters
 | Parameter | Description                                   |
 | --------- | --------------------------------------------- |
-| str       | The string to extract from. Type: VARCHAR     |
-| len       | The number of characters to return. Type: INT |
+| `<str>` | The string to extract from. Type: VARCHAR     |
+| `<len>` | The number of characters to return. Type: INT |
 
 ## Return Value
 
@@ -61,45 +61,45 @@ Special cases:
 SELECT strright('Hello doris', 5);
 ```
 ```text
-+-------------------------+
++----------------------------+
 | strright('Hello doris', 5) |
-+-------------------------+
-| doris                   |
-+-------------------------+
++----------------------------+
+| doris                      |
++----------------------------+
 ```
 
 2. Handling negative length
 ```sql
 SELECT strright('Hello doris', -7);
 ```
 ```text
-+--------------------------+
++-----------------------------+
 | strright('Hello doris', -7) |
-+--------------------------+
-| doris                    |
-+--------------------------+
++-----------------------------+
+| doris                       |
++-----------------------------+
 ```
 
 3. Handling NULL parameter
 ```sql
 SELECT strright('Hello doris', NULL);
 ```
 ```text
-+----------------------------+
++-------------------------------+
 | strright('Hello doris', NULL) |
-+----------------------------+
-| NULL                       |
-+----------------------------+
++-------------------------------+
+| NULL                          |
++-------------------------------+
 ```
 
 4. Handling NULL string
 ```sql
 SELECT strright(NULL, 5);
 ```
 ```text
-+----------------+
++-------------------+
 | strright(NULL, 5) |
-+----------------+
-| NULL           |
-+----------------+
++-------------------+
+| NULL              |
++-------------------+
 ```

docs/sql-manual/sql-functions/scalar-functions/string-functions/substring-index.md

@@ -29,15 +29,15 @@ The SUBSTRING_INDEX function is used to extract a substring from a string based
 ## Syntax
 
 ```sql
-VARCHAR SUBSTRING_INDEX(VARCHAR content, VARCHAR delimiter, INT field)
+SUBSTRING_INDEX(VARCHAR <content>, VARCHAR <delimiter>, INT <field>)
 ```
 
 ## Parameters
 | Parameter | Description                                                                                                     |
 | --------- | --------------------------------------------------------------------------------------------------------------- |
-| content   | The string to be extracted from. Type: VARCHAR                                                                  |
-| delimiter | The delimiter string, case-sensitive and multi-byte safe. Type: VARCHAR                                         |
-| field     | Number of delimiter occurrences. Positive numbers count from left, negative numbers count from right. Type: INT |
+| `<content>` | The string to be extracted from. Type: VARCHAR                                                                  |
+| `<delimiter>` | The delimiter string, case-sensitive and multi-byte safe. Type: VARCHAR                                         |
+| `<field>` | Number of delimiter occurrences. Positive numbers count from left, negative numbers count from right. Type: INT |
 
 Note: The delimiter and field parameters must be constants, variables are not supported.
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/substring.md

@@ -35,15 +35,15 @@ SUBSTR
 ## Syntax
 
 ```sql
-VARCHAR SUBSTRING(VARCHAR str, INT pos [, INT len])
+SUBSTRING(VARCHAR <str>, INT <pos> [, INT <len>])
 ```
 
 ## Parameters
 | Parameter | Description                                      |
 | --------- | ------------------------------------------------ |
-| str       | Source string. Type: VARCHAR                     |
-| pos       | Starting position, can be negative. Type: INT    |
-| len       | Optional parameter, length to extract. Type: INT |
+| `<str>` | Source string. Type: VARCHAR                     |
+| `<pos>` | Starting position, can be negative. Type: INT    |
+| `<len>` | Optional parameter, length to extract. Type: INT |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/to-base64.md

@@ -31,13 +31,13 @@ The TO_BASE64 function is used to convert an input string to Base64 encoded form
 ## Syntax
 
 ```sql
-VARCHAR TO_BASE64(VARCHAR str)
+TO_BASE64(VARCHAR <str>)
 ```
 
 ## Parameters
 | Parameter | Description                                    |
 | --------- | ---------------------------------------------- |
-| str       | The string to be Base64 encoded. Type: VARCHAR |
+| `<str>` | The string to be Base64 encoded. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/top-level-domain.md

@@ -32,13 +32,13 @@ The TOP_LEVEL_DOMAIN function is used to extract the top-level domain from a URL
 ## Syntax
 
 ```sql
-VARCHAR TOP_LEVEL_DOMAIN(VARCHAR url)
+TOP_LEVEL_DOMAIN(VARCHAR <url>)
 ```
 
 ## Parameters
 | Parameter | Description                                                              |
 | --------- | ------------------------------------------------------------------------ |
-| url       | The URL string from which to extract the top-level domain. Type: VARCHAR |
+| `<url>` | The URL string from which to extract the top-level domain. Type: VARCHAR |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/translate.md

@@ -31,15 +31,15 @@ The TRANSLATE function is used for string replacement, converting characters in
 ## Syntax
 
 ```sql
-VARCHAR TRANSLATE(VARCHAR source, VARCHAR from, VARCHAR to)
+TRANSLATE(VARCHAR <source>, VARCHAR <from>, VARCHAR <to>)
 ```
 
 ## Parameters
 | Parameter | Description                                         |
 | --------- | --------------------------------------------------- |
-| source    | The source string to be converted. Type: VARCHAR    |
-| from      | The set of characters to be replaced. Type: VARCHAR |
-| to        | The set of replacement characters. Type: VARCHAR    |
+| `<source>` | The source string to be converted. Type: VARCHAR    |
+| `<from>` | The set of characters to be replaced. Type: VARCHAR |
+| `<to>` | The set of replacement characters. Type: VARCHAR    |
 
 ## Return Value
 

docs/sql-manual/sql-functions/scalar-functions/string-functions/trim-in.md

@@ -33,14 +33,14 @@ The key feature of TRIM_IN is that it removes any combination of characters from
 ## Syntax
 
 ```sql
-VARCHAR trim_in(VARCHAR str[, VARCHAR rhs])
+TRIM_IN(VARCHAR <str> [, VARCHAR <rhs>])
 ```
 
 ## Parameters
 | Parameter | Description                                                            |
 | --------- | ---------------------------------------------------------------------- |
-| str       | The string to be processed. Type: VARCHAR                              |
-| rhs       | Optional parameter, the set of characters to be removed. Type: VARCHAR |
+| `<str>` | The string to be processed. Type: VARCHAR                              |
+| `<rhs>` | Optional parameter, the set of characters to be removed. Type: VARCHAR |
 
 ## Return Value
 

i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/string-functions/count_substrings.md

@@ -29,14 +29,14 @@ COUNT_SUBSTRINGS 函数用于计算一个字符串中指定子串出现的次数
 ## 语法
 
 ```sql
-COUNT_SUBSTRINGS(str, pattern)
+COUNT_SUBSTRINGS(<str>, <pattern>)
 ```
 
 ## 参数
 | 参数    | 说明                           |
 | ------- | ------------------------------ |
-| str     | 需要检测的字符串。类型：STRING |
-| pattern | 需要匹配的子串。类型：STRING   |
+| `<str>`     | 需要检测的字符串。类型：STRING |
+| `<pattern>` | 需要匹配的子串。类型：STRING   |
 
 ## 返回值
 

i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/string-functions/cut-to-first-significant-subdomain.md

@@ -32,13 +32,13 @@ CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN 函数用于从 URL 中提取域名的有效
 ## 语法
 
 ```sql
-VARCHAR CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN(VARCHAR url)
+CUT_TO_FIRST_SIGNIFICANT_SUBDOMAIN(VARCHAR <url>)
 ```
 
 ## 参数
 | 参数 | 说明                                 |
 | ---- | ------------------------------------ |
-| url  | 需要处理的 URL 字符串。类型：VARCHAR |
+| `<url>` | 需要处理的 URL 字符串。类型：VARCHAR |
 
 ## 返回值
 

i18n/zh-CN/docusaurus-plugin-content-docs/current/sql-manual/sql-functions/scalar-functions/string-functions/ltrim-in.md

@@ -33,14 +33,14 @@ LTRIM_IN 的特点是会移除指定字符集合中的任意字符组合，而 L
 ## 语法
 
 ```sql
-VARCHAR LTRIM_IN(VARCHAR str[, VARCHAR rhs])
+LTRIM_IN(VARCHAR <str>[, VARCHAR <rhs>])
 ```
 
 ## 参数
 | 参数 | 说明                                      |
 | ---- | ----------------------------------------- |
-| str  | 需要处理的字符串。类型：VARCHAR           |
-| rhs  | 可选参数，要移除的字符集合。类型：VARCHAR |
+| `<str>`  | 需要处理的字符串。类型：VARCHAR           |
+| `<rhs>`  | 可选参数，要移除的字符集合。类型：VARCHAR |
 
 ## 返回值