docs: formate and note of java doc

docs/en/14-reference/03-connector/04-java.mdx

@@ -440,6 +440,7 @@ TDengine has significantly improved the bind APIs to support data writing (INSER
 - JDBC REST connections do not currently support bind interface
 - The following sample code is based on taos-jdbcdriver-3.2.1
 - The setString method should be called for binary type data, and the setNString method should be called for nchar type data
+- Do not use `db.?` in prepareStatement, should directly use `?`, then specify the database in setTableName, for example: `prepareStatement.setTableName("db.t1")`.
 
 <Tabs defaultValue="native">
 <TabItem value="native" label="native connection">

docs/zh/08-connector/14-java.mdx

@@ -443,6 +443,7 @@ TDengine 的 JDBC 原生连接实现大幅改进了参数绑定方式对数据
 - JDBC REST 连接目前不支持参数绑定
 - 以下示例代码基于 taos-jdbcdriver-3.2.1
 - binary 类型数据需要调用 setString 方法，nchar 类型数据需要调用 setNString 方法
+- 预处理语句中指定子表名称不要使用 `db.?`，应直接使用 `?`，然后在 setTableName 中指定数据库，如：`prepareStatement.setTableName("db.t1")`。
 
 <Tabs defaultValue="native">
 <TabItem value="native" label="原生连接">
@@ -864,7 +865,7 @@ public class ParameterBindingDemo {
 
 用于设定 TAGS 取值的方法总共有：
 
-````java
+```java
 public void setTagNull(int index, int type)
 public void setTagBoolean(int index, boolean value)
 public void setTagInt(int index, int value)
@@ -912,7 +913,7 @@ public class SchemalessJniTest {
         }
     }
 }
-````
+```
 
 </TabItem>
 <TabItem value="ws" label="WebSocket 连接">