Update app/code/Magento/Catalog/Model/ResourceModel/Product/Gallery.php

Co-Authored-By: Alex Paliarush <paliarus@adobe.com>

Author: akaplya

app/code/Magento/Catalog/Model/ResourceModel/Product/Gallery.php

@@ -38,7 +38,7 @@ class Gallery extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
       * Gallery constructor.
       * @param \Magento\Framework\Model\ResourceModel\Db\Context $context
       * @param \Magento\Framework\EntityManager\MetadataPool $metadataPool
-      * @param null $connectionName
+      * @param string $connectionName
       * @throws \Exception
       */
     public function __construct(