docs: fix sample index page back link (it's not always two levels above the home,
so we'll just need the index page to redirect to the browser)

Change-Id: I336c1652037ca2463500297212a4a1c44561f297
diff --git a/res/assets/templates/sampleindex.cs b/res/assets/templates/sampleindex.cs
index 238ac07..6e5891b 100644
--- a/res/assets/templates/sampleindex.cs
+++ b/res/assets/templates/sampleindex.cs
@@ -15,7 +15,7 @@
  </div>
 
 <div id="jd-content">
-<p><a href="../../browser.html?tag=sample">&larr; Back</a></p>
+<p><a href="../index.html">&larr; Back</a></p>
 
 <?cs var:summary ?>