docs: Added "Verifying for ART" to TOC.

Now that "Verifying App Behavior on the Android Runtime (ART)"
(guide/practices/verifying-apps-art.jd) is published, also adding it
to the "API Guides" TOC.

You can verify it at

http://asolovay.mtv:9001/guide/practices/index.html

(...it's the last element in the "Best Practices" submenu.)

Change-Id: If7b445616768d17193309dbd3075b2630652ac96

docs/html/guide/guide_toc.cs

@@ -564,7 +564,11 @@
       <li><a href="<?cs var:toroot ?>guide/practices/tablets-and-handsets.html">
             <span class="en">Supporting Tablets and Handsets</span>
           </a></li>
-
+      <li>
+        <a href="<?cs var:toroot ?>guide/practices/verifying-apps-art.html">
+          <span class="en">Verifying App Behavior on ART</span>
+        </a>
+      </li>
     </ul>
   </li>