Add information about sample rate conversion

Change-Id: Ic579bcf3f465a44cbb93348c4b2ba2f723271d65
diff --git a/src/devices/devices_toc.cs b/src/devices/devices_toc.cs
index c2ac9d5..853c629 100644
--- a/src/devices/devices_toc.cs
+++ b/src/devices/devices_toc.cs
@@ -46,6 +46,7 @@
             </ul>
           </li>
           <li><a href="<?cs var:toroot ?>devices/audio_avoiding_pi.html">Priority Inversion</a></li>
+          <li><a href="<?cs var:toroot ?>devices/audio_src.html">Sample Rate Conversion</a></li>
           <li><a href="<?cs var:toroot ?>devices/audio_terminology.html">Terminology</a></li>
         </ul>
       </li>