MAGETWO-38193: Stabilize story branch

Author: sivaschenko

app/code/Magento/Sales/Model/Resource/EntityAbstract.php

@@ -69,7 +69,7 @@ abstract class EntityAbstract extends AbstractDb
      * @param Manager $sequenceManager
      * @param EntitySnapshot $entitySnapshot
      * @param EntityRelationComposite $entityRelationComposite
-     * @param null $resourcePrefix
+     * @param string $resourcePrefix
      */
     public function __construct(
         \Magento\Framework\Model\Resource\Db\Context $context,