Docs: Add 5.1 R2 packages to site

Bug: 22390714
Change-Id: Ic72a689f38188498d1efef6d871c15791e670163
diff --git a/src/index.jd b/src/index.jd
index 3ef5f67..6fd8aaa 100644
--- a/src/index.jd
+++ b/src/index.jd
@@ -42,6 +42,12 @@
   <div class="landing-docs">
     <div class="col-8">
     <h3>What's New</h3>
+<a href="{@docRoot}compatibility/downloads.html">
+        <h4>CTS 5.1 R2</h4></a>
+        <p>Packages for the 5.1 R2 version of the Android Compatibility Test
+        Suite (CTS) are available for <strong><a
+        href="{@docRoot}compatibility/downloads.html#android-51">download</a></strong>.</p>
+
 <a href="{@docRoot}devices/tech/security/selinux/customize.html">
         <h4>SELinux neverallow Rules</h4></a>
         <p>New guidance has been offered on the use of Security-Enhanced Linux (SELinux) <strong><a
@@ -95,15 +101,6 @@
         <strong><a
         href="{@docRoot}devices/tech/admin/testing-setup.html">testing</a></strong>,
         and more.</p>
-
-<a href="{@docRoot}devices/audio/midi.html">
-        <h4>MIDI and Audio Latency for Developers</h4></a>
-        <p>The Android audio team has published <strong><a
-        href="{@docRoot}devices/audio/latency_app.html">advice to developers
-        for reducing latency</a></strong> and also instructions to partners on
-        implementing the new support for <strong><a
-        href="{@docRoot}devices/audio/midi.html">MIDI</a></strong> protocol now
-        available in AOSP.</p>
     </div>
 
     <div class="col-8">