⏫ Forwardport of #12495 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/12495.patch (created by @vovayatsyuk) based on commit(s):
  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)