Docs: Quick fix, changing ID string in Udacity video link.

Change-Id: I11a36e13988e266fe35eb72bd86c17e3dc72232f
diff --git a/docs/html/training/building-wearables.jd b/docs/html/training/building-wearables.jd
index 5fd59e9..9044928 100644
--- a/docs/html/training/building-wearables.jd
+++ b/docs/html/training/building-wearables.jd
@@ -23,6 +23,6 @@
       </p>
     </div>
     <div class="col-1of2">
-      <iframe width="300" height="169" src="//www.youtube.com/embed/t2JaW-8WDok?utm_source=dac&utm_medium=video&utm_content=andfuntrain&utm_campaign=udacint?rel=0&amp;hd=1" frameborder="0" allowfullscreen></iframe>
+      <iframe width="300" height="169" src="//www.youtube.com/embed/t2JaW-8WDok?utm_source=dac&utm_medium=video&utm_content=build_wear&utm_campaign=udacint?rel=0&amp;hd=1" frameborder="0" allowfullscreen></iframe>
   </div>
-</div>
\ No newline at end of file
+</div>