Doc change: update landing carousel with new videos.

Change-Id: I07abadad059138901821d804a6bcf6ec040a609d
diff --git a/docs/html/jd_collections.js b/docs/html/jd_collections.js
index 739b648..cd2d771 100644
--- a/docs/html/jd_collections.js
+++ b/docs/html/jd_collections.js
@@ -16,10 +16,10 @@
   "index/secondary/carousel": {
     "title": "",
     "resources": [
-      "https://www.youtube.com/watch?v=yJisuP94lHU",
-      "http://www.youtube.com/watch?v=rcU7VEs1hiE",
-      "http://www.youtube.com/watch?v=JFlX9rW7Epc",
-      "http://www.youtube.com/watch?v=4CqXCkcN_d4"
+      "http://www.youtube.com/watch?v=Pms0pcyPbAM",
+      "http://www.youtube.com/watch?v=9m6MoBM-sFI",
+      "http://www.youtube.com/watch?v=e7t3svG9PTk",
+      "http://www.youtube.com/watch?v=J3IvOfvH1ys"
     ]
   },
   "index/multiscreen": {