minor adjustment

Author: Usik2203

lib/internal/Magento/Framework/Profiler/Driver/Standard/Stat.php

@@ -5,10 +5,15 @@
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
+declare(strict_types=1);
+
 namespace Magento\Framework\Profiler\Driver\Standard;
 
 use Magento\Framework\Profiler;
 
+/**
+ * @api
+ */
 class Stat
 {
     /**