Fixed broken link in documentation.

sdk/lib/html/dart2js/html_dart2js.dart

 /// The Dart HTML library.
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_collection-dev';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
@@ skipping 12304 matching lines @@
 
   @JSName('removeEventListener')
   @DomName('XMLHttpRequest.removeEventListener')
   @DocsEditable
   void $dom_removeEventListener(String type, EventListener listener, [bool useCapture]) native;
 
   /**
    * Send the request with any given `data`.
    *
    * See also:
-   * [send() docs](https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest#send())
+   *
+   *   * [send](https://developer.mozilla.org/en-US/docs/DOM/XMLHttpRequest#send%28%29)
    * from MDN.
    */
   @DomName('XMLHttpRequest.send')
   @DocsEditable
   void send([data]) native;
 
   @DomName('XMLHttpRequest.setRequestHeader')
   @DocsEditable
   void setRequestHeader(String header, String value) native;
 
@@ skipping 17549 matching lines @@
       _position = nextPosition;
       return true;
     }
     _current = null;
     _position = _array.length;
     return false;
   }
 
   T get current => _current;
 }