docs: fix plus link

Change-Id: I48d54e107c648d0a00cd2edc2b8bfe7c13013847
diff --git a/docs/html/preview/index.html b/docs/html/preview/index.html
index e657415..7a7465f 100644
--- a/docs/html/preview/index.html
+++ b/docs/html/preview/index.html
@@ -257,7 +257,7 @@
                     Join the community of Android developers testing out the L Developer Preview and
                     share your thoughts and experiences.
                   </p><p class="landing-small">
-                    <a href="https://plus.sandbox.google.com/communities/113159138894928487684">
+                    <a href="https://plus.google.com/communities/113159138894928487684">
                     Discuss on Google+</a>
                     </p>
                 </div>