Docs: Standardize the file header summary for wp-admin/includes/file.php.

Also adds an `@since` version and corrects the `@subpackage` value.

See #33701.

Built from https://develop.svn.wordpress.org/trunk@35221


git-svn-id: http://core.svn.wordpress.org/trunk@35187 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/file.php

@@ -1,11 +1,14 @@
 <?php
 /**
+ * Filesystem API: Top-level functionality
+ *
  * Functions for reading, writing, modifying, and deleting files on the file system.
  * Includes functionality for theme-specific files as well as operations for uploading,
  * archiving, and rendering output when necessary.
  *
  * @package WordPress
- * @subpackage Administration
+ * @subpackage Filesystem
+ * @since 2.3.0
  */
 
 /** The descriptions for theme files. */

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-35220';
+$wp_version = '4.4-alpha-35221';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.