Docs: December 2015 security bulletin

Bug: 25931435
Change-Id: Ic9e7555e6f28da58bd865aa8317f1334270d45d2
diff --git a/src/security/security_toc.cs b/src/security/security_toc.cs
index f0ba2af..790b8e8 100644
--- a/src/security/security_toc.cs
+++ b/src/security/security_toc.cs
@@ -48,8 +48,9 @@
       <a href="<?cs var:toroot ?>security/bulletin/index.html">
         <span class="en">Bulletins</span>
       </a>
-    </div>	  
+    </div>
     <ul>
+      <li><a href="<?cs var:toroot ?>security/bulletin/2015-12-01.html">December 2015</a></li>
       <li><a href="<?cs var:toroot ?>security/bulletin/2015-11-01.html">November 2015</a></li>
       <li><a href="<?cs var:toroot ?>security/bulletin/2015-10-01.html">October 2015</a></li>
       <li><a href="<?cs var:toroot ?>security/bulletin/2015-09-01.html">September 2015</a></li>
@@ -97,7 +98,7 @@
       <li><a href="<?cs var:toroot ?>security/selinux/customize.html">Customization</a></li>
       <li><a href="<?cs var:toroot ?>security/selinux/validate.html">Validation</a></li>
     </ul>
-  </li>	
+  </li>
   <li class="nav-section">
     <div class="nav-section-header">
       <a href="<?cs var:toroot ?>security/verifiedboot/index.html">