Docs: Various corrections and improvements to inline docs and docblocks.

See #57840


git-svn-id: https://develop.svn.wordpress.org/trunk@55753 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/widgets.php

@@ -67,6 +67,8 @@ function wp_list_widgets() {
  * @since 3.1.0
  * @access private
  *
+ * @param array $a First array.
+ * @param array $b Second array.
  * @return int
  */
 function _sort_name_callback( $a, $b ) {