Add missed entry to docs for @return

Author: flancer64

lib/internal/Magento/Framework/Reflection/TypeProcessor.php

@@ -288,6 +288,7 @@ protected function dataObjectGetterDescriptionToFieldDescription($shortDescripti
      *     'type' => <string>$type,
      *     'isRequired' => $isRequired,
      *     'description' => $description
+     *     'parameterCount' => $numberOfRequiredParameters
      * )</pre>
      * @throws \InvalidArgumentException
      */