[x/go.dev] add course ratings

Change-Id: I9ff6c29726afc339c1e966754b214e1366f72c15

X-GoDev-Commit: 05f32e9944e7138b6d0dbc4051133b6f826e4e4f
diff --git a/go.dev/data/learn/cloud.yaml b/go.dev/data/learn/cloud.yaml
index 968f484..c242cd7 100644
--- a/go.dev/data/learn/cloud.yaml
+++ b/go.dev/data/learn/cloud.yaml
@@ -4,22 +4,22 @@
     thumbnail: /images/learn/qwiklabs.png
     length: 1h 10m
     credits: 5
-    rating: 5
+    rating: 4.25
   - title: Use Go Code to Work with Google Cloud Data Sources
     url: https://google.qwiklabs.com/focuses/10531?parent=catalog
     thumbnail: /images/learn/qwiklabs.png
     length: 1h 10m
     credits: 5
-    rating: 5
+    rating: 4.25
   - title: Getting Started with Go on App Engine
     url: https://google.qwiklabs.com/focuses/2754?catalog_rank=%7B%22rank%22%3A1%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=5407947
     thumbnail: /images/learn/qwiklabs.png
     length:  20m
     credits: 1
-    rating: 5
+    rating: 4.15
   - title: HTTP Google Cloud Functions in Go
     url: https://google.qwiklabs.com/focuses/5171?catalog_rank=%7B%22rank%22%3A1%2C%22num_filters%22%3A0%2C%22has_search%22%3Atrue%7D&parent=catalog&search_id=5407953
     thumbnail: /images/learn/qwiklabs.png
     length: 40m
     credits: 5
-    rating: 5
+    rating: 4.5