Update headings to use sentence case.

tools/dom/src/EventStreamProvider.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.
 
 part of html;
 
 /**
  * Adapter for exposing DOM events as Dart streams.
  */
 class _EventStream<T extends Event> extends Stream<T> {
@@ skipping 31 matching lines @@
   Stream<T> matches(String selector);
 
   /**
    * Adds a capturing subscription to this stream.
    *
    * If the target of the event is a descendant of the element from which this
    * stream derives then [onData] is called before the event propagates down to
    * the target. This is the opposite of bubbling behavior, where the event
    * is first processed for the event target and then bubbles upward.
    *
-   * ## Other Resources
+   * ## Other resources
    *
    * * [Event Capture]
    * (http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-flow-capture)
    * from the W3C DOM Events specification.
    */
   StreamSubscription<T> capture(void onData(T event));
 }
 
 /**
  * Adapter for exposing DOM Element events as streams, while also allowing
@@ skipping 358 matching lines @@
 
   ElementStream<T> _forElementList(ElementList e,
       {bool useCapture: false}) {
     return new _ElementListEventStreamImpl(e, _eventTypeGetter(e), useCapture);
   }
 
   String getEventType(EventTarget target) {
     return _eventTypeGetter(target);
   }
 }