- clarify how push.js handle .bar-tab and .bar-title when going from one page to another

- https://github.com/maker/ratchet/issues/119

docs/index.html

@@ -1037,7 +1037,7 @@ document
 <a href="two.html">Two<a>
 </pre>
 
-          <p class="component-note">This will use push to replace everything in the .content div with the .content of two.html. It will also update .bar-title and .bar-tab if you have them on both pages.</p>
+          <p class="component-note">This will use push to replace everything in the .content div with the .content of two.html. Also, it will either update or remove .bar-title and .bar-tab according to their presences in two.html.</p>
 
           <p class="component-description">Now that pages are being loaded through push, it's easy to specify transitions for animations between pages. There are three different transitions to chose from: <code>fade</code>, <code>slide-in</code>, or <code>slide-out</code>.</p>