Removed old rule file.

Author: Harmageddon

libraries/joomla/form/rule/subform.php

@@ -1,10 +1,9 @@
 <?php
 /**
- * @package     Joomla.Platform
- * @subpackage  Form
+ * Joomla! Content Management System
  *
- * @copyright   Copyright (C) 2005 - 2017 Open Source Matters, Inc. All rights reserved.
- * @license     GNU General Public License version 2 or later; see LICENSE
+ * @copyright  Copyright (C) 2005 - 2017 Open Source Matters, Inc. All rights reserved.
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
  */
 
 namespace Joomla\CMS\Form\Rule;