fix set_var hint

Author: weiwh1

docs/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -33,7 +33,7 @@ Doris allows users to manually specify the parallelism of a query to adjust the
 Use SQL HINT to specify the parallelism of a single SQL statement. This allows for flexible control of the parallelism of different SQL statements to achieve the best execution results.
 
 ```sql
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 ### Session Level Adjustment:

i18n/zh-CN/docusaurus-plugin-content-docs/current/query-acceleration/tuning/parallelism-tuning.md

@@ -63,7 +63,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### 会话级别调整：

i18n/zh-CN/docusaurus-plugin-content-docs/current/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -43,7 +43,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### **会话级别调整：**

i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query-acceleration/tuning/parallelism-tuning.md

@@ -63,7 +63,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### 会话级别调整：

i18n/zh-CN/docusaurus-plugin-content-docs/version-2.1/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -43,7 +43,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### **会话级别调整：**

i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query-acceleration/tuning/parallelism-tuning.md

@@ -63,7 +63,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### 会话级别调整：

i18n/zh-CN/docusaurus-plugin-content-docs/version-3.0/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -43,7 +43,7 @@ Doris 可以手动指定查询的并行度，以调整查询执行时并行执
 通过 SQL HINT 来指定单个 SQL 的并行度，这样可以灵活控制不同 SQL 的并行度来取得最佳的执行效果
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 #### **会话级别调整：**

versioned_docs/version-2.1/query-acceleration/tuning/parallelism-tuning.md

@@ -57,7 +57,7 @@ Doris can manually specify the parallelism of a query to adjust the parallel exe
 Use SQL HINT to specify the parallelism of a single SQL, so that the parallelism of different SQLs can be flexibly controlled to achieve the best execution effect.
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 ### Session Level Adjustment:

versioned_docs/version-2.1/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -33,7 +33,7 @@ Doris allows users to manually specify the parallelism of a query to adjust the
 Use SQL HINT to specify the parallelism of a single SQL statement. This allows for flexible control of the parallelism of different SQL statements to achieve the best execution results.
 
 ```sql
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 ### Session Level Adjustment:

versioned_docs/version-3.0/query-acceleration/tuning/parallelism-tuning.md

@@ -57,7 +57,7 @@ Doris can manually specify the parallelism of a query to adjust the parallel exe
 Use SQL HINT to specify the parallelism of a single SQL, so that the parallelism of different SQLs can be flexibly controlled to achieve the best execution effect.
 
 ```SQL
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 ### Session Level Adjustment:

versioned_docs/version-3.0/query-acceleration/tuning/tuning-execution/parallelism-tuning.md

@@ -33,7 +33,7 @@ Doris allows users to manually specify the parallelism of a query to adjust the
 Use SQL HINT to specify the parallelism of a single SQL statement. This allows for flexible control of the parallelism of different SQL statements to achieve the best execution results.
 
 ```sql
-select /*SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
+select /*+ SET_VAR("parallel_pipeline_task_num=8")*/ * from nation, lineitem where lineitem.l_suppkey = nation.n_nationkey
 ```
 
 ### Session Level Adjustment: