Fix the main.jsbundle url in comment

Summary:
Fix the url in comment
Closes https://github.com/facebook/react-native/pull/1959
Github Author: Pylipala <pylipala@gmail.com>

Examples/UIExplorer/UIExplorer/AppDelegate.m

@@ -43,7 +43,7 @@
    * Load from pre-bundled file on disk. To re-generate the static bundle, `cd`
    * to your Xcode project folder and run
    *
-   * $ curl 'http://localhost:8081/Examples/UIExplorer/UIExplorerApp.includeRequire.runModule.bundle' -o main.jsbundle
+   * $ curl 'http://localhost:8081/Examples/UIExplorer/UIExplorerApp.ios.includeRequire.runModule.bundle' -o main.jsbundle
    *
    * then add the `main.jsbundle` file to your project and uncomment this line:
    */