New page, release_keys.jd, requested by bug 1884389.
Small fix (broken link) to display_drivers.jd.
Audio.jd has new right-side in-page TOC.
telephony.jd fixes a bug.
diff --git a/pdk/docs/guide/pdk_toc.cs b/pdk/docs/guide/pdk_toc.cs
index 1ab43b6..3b79cef 100644
--- a/pdk/docs/guide/pdk_toc.cs
+++ b/pdk/docs/guide/pdk_toc.cs
@@ -13,7 +13,8 @@
      <li><a href="<?cs var:toroot ?>guide/build_new_device.html">Building New Device</a></li>
      <li><a href="<?cs var:toroot ?>guide/build_cookbook.html">Build Cookbook</a></li>
      <li><a href="<?cs var:toroot ?>guide/bring_up.html">Bring up</a></li>
-  </ul>
+     <li><a href="<?cs var:toroot ?>guide/release_keys.html">Release Keys and Signing Builds</a></li> 
+ </ul>
 </li>
 
 <li> <h2>Customization</h2>