MAGETWO-84804: Fixed invalid parameter type in phpdoc block in Topmen…

…u class #12495

 - Merge Pull Request #12495 from vovayatsyuk/magento2:fix-phpdoc-topmenu
 - Merged commits:
   1. fe3033e
   2. 80520c5

app/code/Magento/Theme/Block/Html/Topmenu.php

@@ -331,7 +331,7 @@ protected function _getMenuItemClasses(\Magento\Framework\Data\Tree\Node $item)
     /**
      * Add identity
      *
-     * @param array $identity
+     * @param string|array $identity
      * @return void
      */
     public function addIdentity($identity)