fixing bug 18336, skipWhile comment was wrong

src/site/docs/tutorials/streams/index.markdown

 ---
 layout: tutorial
 title: "Use Streams for Data"
 description: 
   Learn how to consume single-subscriber and broadcast streams, 
   with real-world uses.
 tutorial:
   id: streams
 next: fetchdata/
 next-title: "Fetch Data Dynamically"
@@ skipping 207 matching lines @@
     .listen((value) => print("skip: $value")); // skip: 4
                                                // skip: 5
 
 broadcastStream
     .takeWhile((value) => value < 3) // take while true
     .listen((value) => print("takeWhile: $value")); // takeWhile: 1
                                                     // takeWhile: 2
 
 broadcastStream
     .skipWhile((value) => value < 3) // skip while true
-    .listen((value) => print("skipWhile: $value")); // skipWhile: 4
+    .listen((value) => print("skipWhile: $value")); // skipWhile: 3
+                                                    // skipWhile: 4
                                                     // skipWhile: 5
 {% endprettify %}<!--- END(stream_subsets) -->
 
 ### Transforming stream data
 
 Another useful method is the `transform()` method, which takes a 
 `StreamTransformer` instance.  This allows you to modify the contents of the 
 stream.  The `StreamTransformer.fromHandlers` constructor takes a `handleData` function, 
 which is called for each value passed from the stream.  You can modify the value 
 as you wish, and add it back to the `StreamSink`, which results in the modified 
@@ skipping 262 matching lines @@
 Chris Buckett is a Technical Manager for
 [Entity Group Ltd](http://www.entity.co.uk/), responsible for building and
 delivering enterprise client-server webapps, mostly with GWT, Java and .Net.
 He runs the [dartwatch.com blog](http://blog.dartwatch.com/), and has written
 the book _Dart in Action_, which is available
 at [manning.com](http://www.manning.com/buckett).
 
 {% endcapture %}
 
 {% include tutorial.html %}