[SPARK-37286][DOCS][FOLLOWUP] Fix the wrong parameter name for Javadoc

### What changes were proposed in this pull request?

This PR fixes an issue that the Javadoc generation fails due to the wrong parameter name of a method added in SPARK-37286 (apache#34554).
https://github.com/apache/spark/runs/4409267346?check_suite_focus=true#step:9:5081

### Why are the changes needed?

To keep the build clean.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

GA itself.

Closes apache#34801 from sarutak/followup-SPARK-37286.

Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Sean Owen <srowen@gmail.com>

Author: sarutak

sql/core/src/main/scala/org/apache/spark/sql/jdbc/JdbcDialects.scala

@@ -193,7 +193,7 @@ abstract class JdbcDialect extends Serializable with Logging{
 
   /**
    * Converts aggregate function to String representing a SQL expression.
-   * @param aggregate The aggregate function to be converted.
+   * @param aggFunction The aggregate function to be converted.
    * @return Converted value.
    */
   @Since("3.3.0")