Make html metadata follow the spec.

tools/dom/docs/lib/docs.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.
 
 /**
  * A library for extracting the documentation from the various HTML libraries
  * ([dart:html], [dart:svg], [dart:web_audio], [dart:indexed_db]) and saving
  * those documentation comments to a JSON file.
  */
 
@@ skipping 127 matching lines @@
       convertedJson.putIfAbsent(libMirror.simpleName, () =>
           libraryJson);
     }
   }
 
   return convertedJson;
 }
 
 /// Filter out mirrors that are private, or which are not part of this docs
 /// process. That is, ones without the DocsEditable annotation.
-/// If [ignoreDocsEditable] is true, relax the restriction on @DocsEditable.
+/// If [ignoreDocsEditable] is true, relax the restriction on @DocsEditable().
 /// This is to account for classes that are defined in a template, but whose
 /// members are generated.
 List<DeclarationMirror> _sortAndFilterMirrors(List<DeclarationMirror> mirrors,
     {ignoreDocsEditable: false}) {
 
   var filteredMirrors = mirrors.where((DeclarationMirror c) =>
       !domNames(c).isEmpty &&
       !displayName(c).startsWith('_') &&
       (!ignoreDocsEditable ? (findMetadata(c.metadata, 'DocsEditable') != null)
           : true))
@@ skipping 26 matching lines @@
     for (var s in tags.reflectee.split(',')) {
       domNames.add(s.trim());
     }
 
     if (domNames.length == 1 && domNames[0] == 'none') return <String>[];
     return domNames;
   } else {
     return <String>[];
   }
 }