ACQE-6085 : Change the access property

Author: manjusha729

src/Magento/FunctionalTestingFramework/StaticCheck/ClassFileNamingCheck.php

@@ -125,7 +125,9 @@ public function getOutput()
 
     /**
      * Returns Violations if found
-     * @return string
+     * @param  $files SplFileInfo
+     * @param  $fileType string
+     * @return array
      */
     private function findErrorsInFileSet($files, $fileType)
     {