docs(http.ts): Fix MockBackend examples using backend.connections observer

Properly format observer examples.

modules/angular2/http.ts

@@ -141,6 +141,7 @@ export {URLSearchParams} from './src/http/url_search_params';
  *       // Send a response to the request
  *       connection.mockRespond(response);
  *     });
+ *   }
  * });
  *
  * http.get('people.json').observer({
@@ -269,6 +270,7 @@ export const HTTP_BINDINGS = HTTP_PROVIDERS;
  *       // Send a response to the request
  *       connection.mockRespond(response);
  *     });
+ *   }
  * });
 
  * jsonp.get('people.json').observer({