Docs: Add missing documentation for WP_*_Query::get_search_sql() method parameters.

Includes renaming the `$cols` parameter to `$columns` for consistency across the classes.

Follow-up to [42876], [53272-53276].

See #54729.

git-svn-id: https://develop.svn.wordpress.org/trunk@53280 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-term-query.php

@@ -1068,8 +1068,8 @@ class WP_Term_Query {
 	 *
 	 * @global wpdb $wpdb WordPress database abstraction object.
 	 *
-	 * @param string $search
-	 * @return string
+	 * @param string $search Search string.
+	 * @return string Search SQL.
 	 */
 	protected function get_search_sql( $search ) {
 		global $wpdb;