add url as reference

playbooks/roles/android_sdk/tasks/main.yml

@@ -65,6 +65,10 @@
     state: link
     owner: "{{ android_user }}"
     group: "{{ android_group }}"
+# TEMPORARY FIX TO https://code.google.com/p/android/issues/detail?id=228113
+# The version of the Android ARM system image used by the mobile team for screenshot
+# testing is currently unavailable. In the meantime, download a cached version on
+# s3.
 # Download cached version of Android Sys image, because it is no longer available
 # via the Android SDK
 - name: Download cached version of Android Sys Image 23 from s3