Make html metadata follow the spec.

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

 // 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.
 
 part of $LIBRARYNAME;
 
-@DocsEditable
+@DocsEditable()
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   @DomName('HTMLTableElement.tBodies')
   List<TableSectionElement> get tBodies =>
   new _WrappedList<TableSectionElement>($dom_tBodies);
 
   @DomName('HTMLTableElement.rows')
   List<TableRowElement> get rows =>
       new _WrappedList<TableRowElement>($dom_rows);
 
@@ skipping 15 matching lines @@
     var tbody = new Element.tag('tbody');
     this.children.add(tbody);
     return tbody;
   }
 
   @JSName('createTBody')
   TableSectionElement _createTBody() native;
 $endif
 
 $!MEMBERS}