Docs: Add a file header description and `@since` version to wp-includes/widget-functions.php, introduced in [33746].

Also adds sub-section headers per the inline documentation standards for syntax.

See [33746]. See #33413.

Built from https://develop.svn.wordpress.org/trunk@33757


git-svn-id: http://core.svn.wordpress.org/trunk@33725 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-33756';
+$wp_version = '4.4-alpha-33757';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

wp-includes/widget-functions.php

@@ -1,10 +1,15 @@
 <?php
 /**
+ * Core widgets functionality
+ *
  * @package WordPress
  * @subpackage Widgets
+ * @since 4.4.0
  */
 
-/* Template tags & API functions */
+//
+// Template tags & API functions
+//
 
 /**
  * Register a widget
@@ -750,7 +755,9 @@ function is_active_sidebar( $index ) {
 	return apply_filters( 'is_active_sidebar', $is_active_sidebar, $index );
 }
 
-/* Internal Functions */
+//
+// Internal Functions
+//
 
 /**
  * Retrieve full list of sidebars and their widget instance IDs.