Fix type hint of @message declaration as the "setWidgetParameters" method allows arrays too

Author: avstudnitz

app/code/Magento/Widget/Model/Widget/Instance.php

@@ -15,7 +15,7 @@
  * @method string getTitle()
  * @method \Magento\Widget\Model\Widget\Instance setTitle(string $value)
  * @method \Magento\Widget\Model\Widget\Instance setStoreIds(string $value)
- * @method \Magento\Widget\Model\Widget\Instance setWidgetParameters(string $value)
+ * @method \Magento\Widget\Model\Widget\Instance setWidgetParameters(string|array $value)
  * @method int getSortOrder()
  * @method \Magento\Widget\Model\Widget\Instance setSortOrder(int $value)
  * @method \Magento\Widget\Model\Widget\Instance setThemeId(int $value)