Merge pull request #8 from w3c/dontcallmedom-promise-boolean

Fix markup for promise<boolean>

index.html

@@ -175,7 +175,7 @@ <h2><code><a>RemotePlayback</a></code> interface</h2>
           // Resolves with |true| if a device was picked and a session is
           // initiating, |false| otherwise.
           // TODO: consider a better name?
-          Promise<boolean> start();
+          Promise&lt;boolean&gt;start();
         };
 
         enum RemotePlaybackState {