Docs: Add missing @param tag for show_post_locked_dialog filter.

Props keesiemeijer.
Fixes #39479.

git-svn-id: https://develop.svn.wordpress.org/trunk@39710 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/post.php

@@ -1516,6 +1516,7 @@ function _admin_notice_post_locked() {
 		 * @since 3.6.0
 		 *
 		 * @param bool         $display Whether to display the dialog. Default true.
+		 * @param WP_Post      $post    Post object.
 		 * @param WP_User|bool $user    WP_User object on success, false otherwise.
 		 */
 		if ( ! apply_filters( 'show_post_locked_dialog', true, $post, $user ) )