Docs: Add missing parameter and return descriptions to the DocBlock for _wp_get_user_contactmethods().

See #32246.


git-svn-id: https://develop.svn.wordpress.org/trunk@35986 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/user.php

@@ -1897,8 +1897,13 @@ function wp_get_user_contact_methods( $user = null ) {
 /**
  * The old private function for setting up user contact methods.
  *
+ * Use wp_get_user_contact_methods() instead.
+ *
  * @since 2.9.0
  * @access private
+ *
+ * @param WP_User $user Optional. WP_User object. Default null.
+ * @return array Array of contact methods and their labels.
  */
 function _wp_get_user_contactmethods( $user = null ) {
 	return wp_get_user_contact_methods( $user );