Cleanup: Prefer React.Element over React$?Element

Reviewed By: vjeux

Differential Revision: D4013049

fbshipit-source-id: 18a447fdbc584418d6a51770363bcd221e7fb7dc

Examples/UIExplorer/js/AdSupportIOSExample.js

@@ -38,7 +38,7 @@ exports.description = 'Example of using the ad support API.';
 exports.examples = [
   {
     title: 'Ad Support IOS',
-    render: function(): ReactElement<any> {
+    render: function(): React.Element<any> {
       return <AdSupportIOSExample />;
     },
   }