Document the $user_id parameter added to the 'admin_color_scheme_picker' hook in 3.8.1.

Props Ipstenu.
Fixes #30551.

Built from https://develop.svn.wordpress.org/trunk@30632


git-svn-id: http://core.svn.wordpress.org/trunk@30622 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/user-edit.php

@@ -269,6 +269,9 @@ if ( ! IS_PROFILE_PAGE ) {
  * and if there is more than one defined color scheme for the admin.
  *
  * @since 3.0.0
+ * @since 3.8.1 Added `$user_id` parameter.
+ *
+ * @param int $user_id The user ID.
  */
 ?>
 <td><?php do_action( 'admin_color_scheme_picker', $user_id ); ?></td>