fixed grabage in markup

public/app/plugins/datasource/prometheus/components/PromStart.tsx

@@ -6,7 +6,7 @@ export default class PromStart extends PureComponent<any> {
   render() {
     return (
       <div className="grafana-info-box">
-        <PromCheatSheet onClickExample={this.props.onClickExample} />} etdiv>
+        <PromCheatSheet onClickExample={this.props.onClickExample} />
       </div>
     );
   }