Cleanup: Prefer React.Element over React$?Element

Reviewed By: vjeux

Differential Revision: D4013049

fbshipit-source-id: 18a447fdbc584418d6a51770363bcd221e7fb7dc

Examples/UIExplorer/js/UIExplorerExampleContainer.js

@@ -51,7 +51,7 @@ class UIExplorerExampleContainer extends React.Component {
     );
   }
 
-  render(): ReactElement<any> {
+  render(): React.Element<any> {
     if (!this.props.module.examples) {
       return <this.props.module />;
     }