Add audio latency design

Change-Id: I79e3797a087f8515c00ed7389afde33bd83cd8ef
diff --git a/src/devices/devices_toc.cs b/src/devices/devices_toc.cs
index 5aae255..f5f4550 100644
--- a/src/devices/devices_toc.cs
+++ b/src/devices/devices_toc.cs
@@ -35,6 +35,7 @@
           <li><a href="<?cs var:toroot ?>devices/audio_latency.html">Latency</a></li>
           <li><a href="<?cs var:toroot ?>devices/audio_warmup.html">Warmup</a></li>
           <li><a href="<?cs var:toroot ?>devices/audio_avoiding_pi.html">Avoiding Priority Inversion</a></li>
+          <li><a href="<?cs var:toroot ?>devices/latency_design.html">Design For Reduced Latency</a></li>
         </ul>
       </li>
       <li><a href="<?cs var:toroot ?>devices/camera.html">Camera v1</a></li>