docs: M Preview landing page

Change-Id: Ib0e49713f105823898ca5f76d6d6eb4fad54df5e
diff --git a/docs/html/preview/reference.jd b/docs/html/preview/reference.jd
index ee1f24d..2d30c62 100644
--- a/docs/html/preview/reference.jd
+++ b/docs/html/preview/reference.jd
@@ -9,7 +9,7 @@
 
 <ul>
   <li>
-    <a href="http://storage.googleapis.com/androiddevelopers/preview/l-developer-preview-reference.zip">
+    <a href="http://storage.googleapis.com/androiddevelopers/preview/m-developer-preview-reference.zip">
       M Developer Preview reference</a>
   </li>
 </ul>
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