Add @global annotations for wp-admin/*.

See #32444.


git-svn-id: https://develop.svn.wordpress.org/trunk@32642 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/admin-footer.php

@@ -81,6 +81,7 @@ do_action( 'admin_print_footer_scripts' );
  *
  * @since 2.8.0
  *
+ * @global string $hook_suffix
  * @param string $hook_suffix The current admin page.
  */
 do_action( "admin_footer-" . $GLOBALS['hook_suffix'] );