Fixed example in dart:html Events

tools/dom/templates/html/impl/impl_EventTarget.darttemplate

 // Copyright (c) 2012, 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.
 
 part of $LIBRARYNAME;
 
 /**
  * Base class that supports listening for and dispatching browser events.
  *
  * Normally events are accessed via the Stream getter:
  *
  *     element.onMouseOver.listen((e) => print('Mouse over!'));
  *
  * To access bubbling events which are declared on one element, but may bubble
  * up to another element type (common for MediaElement events):
  *
  *     MediaElement.pauseEvent.forTarget(document.body).listen(...);
  *
  * To useCapture on events:
  *
  *     Element.keyDownEvent.forTarget(element, useCapture: true).listen(...);
  *
  * Custom events can be declared as:
  *
- *    class DataGenerator {
- *      static EventStreamProvider<Event> dataEvent =
- *          new EventStreamProvider('data');
- *    }
+ *     class DataGenerator {
+ *       static EventStreamProvider<Event> dataEvent =
+ *           new EventStreamProvider('data');
+ *     }
  *
  * Then listeners should access the event with:
  *
  *     DataGenerator.dataEvent.forTarget(element).listen(...);
  *
  * Custom events can also be accessed as:
  *
  *     element.on['some_event'].listen(...);
  *
  * This approach is generally discouraged as it loses the event typing and
@@ skipping 56 matching lines @@
   // Custom element created callback.
   EventTarget._created();
 
   /**
    * This is an ease-of-use accessor for event streams which should only be
    * used when an explicit accessor is not available.
    */
   Events get on => new Events(this);
 $!MEMBERS
 }