update 404'd source.android.com URLs

Change-Id: Ia902f1bd737eb1ecc0a015e9d63fd8a05cf3ae26
diff --git a/docs/howto_use_cupcake_sdk.txt b/docs/howto_use_cupcake_sdk.txt
index b131230..8107357 100644
--- a/docs/howto_use_cupcake_sdk.txt
+++ b/docs/howto_use_cupcake_sdk.txt
@@ -365,7 +365,7 @@
 
 This completes the howto guide on how to use the new Cupcake SDK.
 Feedback is welcome on the public Android Open Source forums:
-  http://source.android.com/discuss
+  http://source.android.com/community
 
 -end-