Fix suggestions about using init.dart

pkg/polymer/lib/init.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Library that automatically initializes polymer elements without having to
  * write a main for your application.
  *
  * If a polymer application is written entirely with `<polymer-element>` tags
  * and there is no initialization code that needs to happen before these
  * elements are created, then, instead of creating your own `main`, you can
  * simply include a script tag loading this library:
  *
- *    <script type="application/dart" src="packages/polymer/init.dart">
+ *    <script type="application/dart">import "package:polymer/init.dart";
  *    </script>
  *
  * This script tag should be placed after all HTML imports on your page.
  */
 library polymer.init;
 
 import 'package:polymer/polymer.dart';
 
 main() => initPolymer();