Allow to reset FileInputField internal state by calling resetState function on its ref (#630)

Author: bedrich-schindler

src/components/FileInputField/README.md

@@ -241,7 +241,6 @@ set the `multiple` prop to `true`.
 If you need to reset the input state, you can do it by calling the
 `resetState` method on the component's ref.
 
-
 ```docoff-react-preview
 const fileInputRef = React.useRef();