[Improve][Doc] Update kerberos part of kafka doc (#9031)

Author: Hisoka-X

docs/en/connector-v2/sink/Kafka.md

@@ -198,6 +198,8 @@ sink {
 
 ### Kerberos Authentication Example
 
+Please set JVM parameters `java.security.krb5.conf` before starting the SeaTunnel or update default `krb5.conf` in `/etc/krb5.conf`.
+
 Sink Config
 
 ```
@@ -211,7 +213,6 @@ sink {
             security.protocol=SASL_PLAINTEXT
             sasl.kerberos.service.name=kafka
             sasl.mechanism=GSSAPI
-            java.security.krb5.conf="/etc/krb5.conf"
             sasl.jaas.config="com.sun.security.auth.module.Krb5LoginModule required \n        useKeyTab=true \n        storeKey=true  \n        keyTab=\"/path/to/xxx.keytab\" \n        principal=\"[email protected]\";"
         }
     }

docs/en/connector-v2/source/Kafka.md

@@ -185,6 +185,8 @@ source {
 
 ### Kerberos Authentication Example
 
+Please set JVM parameters `java.security.krb5.conf` before starting the SeaTunnel or update default `krb5.conf` in `/etc/krb5.conf`.
+
 Source Config
 
 ```
@@ -197,7 +199,6 @@ source {
             security.protocol=SASL_PLAINTEXT
             sasl.kerberos.service.name=kafka
             sasl.mechanism=GSSAPI
-            java.security.krb5.conf="/etc/krb5.conf"
             sasl.jaas.config="com.sun.security.auth.module.Krb5LoginModule required \n        useKeyTab=true \n        storeKey=true  \n        keyTab=\"/path/to/xxx.keytab\" \n        principal=\"[email protected]\";"
         }
     }

docs/zh/connector-v2/sink/Kafka.md

@@ -198,6 +198,31 @@ sink {
 }
 ```
 
+### Kerberos 认证示例
+
+请在启动 SeaTunnel 之前设置 JVM 参数 `java.security.krb5.conf` 或更新 `/etc/krb5.conf` 中的默认 `krb5.conf`。
+
+源配置示例：
+
+```hocon
+source {
+   Kafka {
+      topic = "seatunnel"
+      bootstrap.servers = "localhost:9092"
+      format = json
+      kafka.request.timeout.ms = 60000
+      semantics = EXACTLY_ONCE
+      kafka.config = {
+         security.protocol = SASL_PLAINTEXT
+         sasl.kerberos.service.name = kafka
+         sasl.mechanism = GSSAPI
+         sasl.jaas.config = "com.sun.security.auth.module.Krb5LoginModule required \n        useKeyTab=true \n        storeKey=true  \n        keyTab=\"/path/to/xxx.keytab\" \n        principal=\"[email protected]\";"
+      }
+   }
+}
+```
+
+
 ### Protobuf配置
 
 `format` 设置为 `protobuf`，配置`protobuf`数据结构，`protobuf_message_name`和`protobuf_schema`参数

docs/zh/connector-v2/source/Kafka.md

@@ -177,6 +177,8 @@ source {
 
 ### Kerberos 认证示例
 
+请在启动 SeaTunnel 之前设置 JVM 参数 `java.security.krb5.conf` 或更新 `/etc/krb5.conf` 中的默认 `krb5.conf`。
+
 源配置示例：
 
 ```hocon
@@ -189,7 +191,6 @@ source {
             security.protocol=SASL_PLAINTEXT
             sasl.kerberos.service.name=kafka
             sasl.mechanism=GSSAPI
-            java.security.krb5.conf="/etc/krb5.conf"
             sasl.jaas.config="com.sun.security.auth.module.Krb5LoginModule required \n        useKeyTab=true \n        storeKey=true  \n        keyTab=\"/path/to/xxx.keytab\" \n        principal=\"[email protected]\";"
         }
     }