Docs: Add 6.0 security enhancements

Bug: 24889601
Change-Id: I4bcd36256cf90aed17ff46e94bc3a6ad300353ac
diff --git a/src/devices/devices_toc.cs b/src/devices/devices_toc.cs
index 7c73238..c1149ec 100644
--- a/src/devices/devices_toc.cs
+++ b/src/devices/devices_toc.cs
@@ -310,6 +310,7 @@
                   </a>
                 </div>
                 <ul>
+                  <li><a href="<?cs var:toroot ?>devices/tech/security/enhancements/enhancements60.html">Android 6.0</a></li>
                   <li><a href="<?cs var:toroot ?>devices/tech/security/enhancements/enhancements50.html">Android 5.0</a></li>
                   <li><a href="<?cs var:toroot ?>devices/tech/security/enhancements/enhancements44.html">Android 4.4</a></li>
                   <li><a href="<?cs var:toroot ?>devices/tech/security/enhancements/enhancements43.html">Android 4.3</a></li>