docs: M Preview landing page

Change-Id: Ib0e49713f105823898ca5f76d6d6eb4fad54df5e
diff --git a/docs/html/preview/api-overview.jd b/docs/html/preview/api-overview.jd
index f72ffbb..dde3c7be 100644
--- a/docs/html/preview/api-overview.jd
+++ b/docs/html/preview/api-overview.jd
@@ -1,5 +1,5 @@
 page.title=API Overview
-excludeFromSuggestions=true
+page.keywords=preview,sdk,compatibility
 sdk.platform.apiLevel=22
 @jd:body