Docs: Adding CTS pages to home, fixing broken link to Downloads

Bug: 11989760
Change-Id: If313d2796a282a510d9051a299f8fcd4ef6f9159
diff --git a/src/compatibility/cts/interpret.jd b/src/compatibility/cts/interpret.jd
index 20ee843..c8468d1 100644
--- a/src/compatibility/cts/interpret.jd
+++ b/src/compatibility/cts/interpret.jd
@@ -25,7 +25,7 @@
 <p>If you have built the CTS yourself, <em>$CTS_ROOT</em> will resemble the
 path <em>out/host/linux-x86/cts</em> but differ by platform. This reflects the
 path where you have uncompressed the prebuilt official CTS <a
-href="downloads.html">downloaded</a> from this site.</p>
+href="{@docRoot}compatibility/downloads.html">downloaded</a> from this site.</p>
 
 <p>Inside the zip, the testResult.xml file contains the actual results—open
 this file in any web browser (HTML5 compatible browser recommended) to view the