Doc change: updates for preview.

Change-Id: Ie741785ae4b21373fa49dbd7f725cab1f812891a
diff --git a/docs/html/preview/samples.jd b/docs/html/preview/samples.jd
index b3836f8..45c9293 100644
--- a/docs/html/preview/samples.jd
+++ b/docs/html/preview/samples.jd
@@ -1,5 +1,5 @@
 page.title=Samples
-
+page.image=images/cards/card-samples_2x.png
 @jd:body
 
 <p>