docs: N Developer Preview 2 downloads

- system image download links for DP2
- OTA download links for DP2
- documentation download links for DP2

Change-Id: Ibe0127fd7d5efec90478de07eb2a7b3d342bd67c
diff --git a/docs/html/preview/setup-sdk.jd b/docs/html/preview/setup-sdk.jd
index 2793d59..9e318cf 100644
--- a/docs/html/preview/setup-sdk.jd
+++ b/docs/html/preview/setup-sdk.jd
@@ -139,11 +139,11 @@
   </tr>
   <tr>
     <td style="white-space: nowrap">
-    <a href="{@docRoot}shareables/preview/n-preview-1-docs.zip"
-      >n-preview-1-docs.zip</a></td>
+    <a href="{@docRoot}shareables/preview/n-preview-2-docs.zip"
+      >n-preview-2-docs.zip</a></td>
     <td width="100%">
-      MD5: 4ab33ccbe698f46f125cc5b807cf9c2f<br>
-      SHA-1: 6a3880b3ccd19614daae5a4d0698ea6ae11c20a5
+      MD5: c02732760f468bd97cd94c1b76361229<br>
+      SHA-1: 591eabe168c909799f6d8dcbe7b126c25ea8b04d
     </td>
   </tr>
 <table>