Docs: Clarify the class DocBlock summary for `WP_Screen`.

See #32246.

Built from https://develop.svn.wordpress.org/trunk@34422


git-svn-id: http://core.svn.wordpress.org/trunk@34386 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-screen.php

@@ -8,10 +8,9 @@
  */
 
 /**
- * A class representing the admin screen.
+ * Core class used to implement an admin screen API.
  *
  * @since 3.3.0
- * @access public
  */
 final class WP_Screen {
 	/**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34421';
+$wp_version = '4.4-alpha-34422';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.