Docs: Add a missing summary, `@since` version, and parameter descriptions to the DocBlock for `_register_widget_update_callback()`.

Introduced in [10798].

See #32246.

Built from https://develop.svn.wordpress.org/trunk@35989


git-svn-id: http://core.svn.wordpress.org/trunk@35954 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-35988';
+$wp_version = '4.5-alpha-35989';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-includes/widgets.php

@@ -513,13 +513,18 @@ function wp_register_widget_control( $id, $name, $control_callback, $options = a
 }
 
 /**
+ * Registers the update callback for a widget.
+ *
+ * @since 2.8.0
+ *
  * @global array $wp_registered_widget_updates
  *
- * @param string   $id_base
- * @param callable $update_callback
- * @param array    $options
+ * @param string   $id_base         The base ID of a widget created by extending WP_Widget.
+ * @param callable $update_callback Update callback method for the widget.
+ * @param array    $options         Optional. Widget control options. See {@see wp_register_widget_control()}.
+ *                                  Default empty array.
  */
-function _register_widget_update_callback($id_base, $update_callback, $options = array()) {
+function _register_widget_update_callback( $id_base, $update_callback, $options = array() ) {
 	global $wp_registered_widget_updates;
 
 	if ( isset($wp_registered_widget_updates[$id_base]) ) {