Docs: Add 6.0 security enhancements to home

Bug: 24889601
Change-Id: Ifa4dce743f09ffe1511f19abd3d0c8afdb14e62f
diff --git a/src/index.jd b/src/index.jd
index fbf5a35..b77ab6e 100644
--- a/src/index.jd
+++ b/src/index.jd
@@ -60,6 +60,13 @@
         href="{@docRoot}reference/packages.html">Trade Federation Testing
         Suite</a></strong> reference files have been updated for Android 6.0.</p>
 
+<a href="{@docRoot}devices/tech/security/enhancements/index.html">
+        <h4>Android 6.0 Security Enhancements</h4></a>
+        <p>The Android security team lists the latest measures undertaken to
+        strengthen the operating system in the new <strong><a
+        href="{@docRoot}devices/tech/security/enhancements/enhancements60.html">Security
+        Enhancements in Android 6.0</a></strong>.</p>
+
 <a href="{@docRoot}devices/tech/power/index.html">
         <h4>Doze and App Standby</h4></a>
         <p>New battery-saving features <em>Doze</em> and <em>App Standby</em>
@@ -104,14 +111,6 @@
         system</a></strong>. And carriers get <strong><a
         href="{@docRoot}devices/tech/config/carrier.html">custom
         configuration</a></strong>.</p>
-
-<a href="{@docRoot}devices/tech/debug/index.html">
-        <h4>Tooling</h4></a>
-        <p>Information on the <strong><a href="{@docRoot}source/jack.html">Jack
-        (Java Android Compiler Kit)</a></strong> default toolchain in Android 6.0 is
-        available, as well as instructions for <strong><a
-        href="{@docRoot}devices/tech/dalvik/gc-debug.html">debugging garbage collection
-        in ART</a></strong>.</p>
     </div>
 
     <div class="col-8">