docs: fix l preview bugs

Change-Id: Ic89fea620ba458c604ccdeeb6da471c807a71fef
diff --git a/docs/html/preview/reference.jd b/docs/html/preview/reference.jd
new file mode 100644
index 0000000..f70f7a2
--- /dev/null
+++ b/docs/html/preview/reference.jd
@@ -0,0 +1,13 @@
+page.title=Reference
+
+@jd:body
+
+<p>The reference documentation and API difference report are available as downloadable packages.
+</p>
+
+<ul>
+  <li><a href="{@docRoot}preview/l-developer-preview-reference.zip">L
+  Developer Preview reference</a></li>
+  <li><a href="{@docRoot}preview/l-developer-preview-api-diff.zip">L
+  Developer Preview difference report</a></li>
+</ul>
\ No newline at end of file