docs: add missing restoreFocus prop description in Menu's StoryBook page (#1933)

Author: ze-flo

packages/dropdowns/src/elements/menu/Menu.tsx

@@ -148,6 +148,7 @@ Menu.propTypes = {
   minHeight: PropTypes.string,
   onChange: PropTypes.func,
   placement: PropTypes.oneOf(PLACEMENT),
+  restoreFocus: PropTypes.bool,
   selectedItems: PropTypes.arrayOf(PropTypes.any),
   zIndex: PropTypes.number
 };