Merge "Fix androidx onboarding doc link" am: 1bdfd997ec am: 96dd933a78 am: 7d178c11b3 am: ff99a9edeb

Original change: https://android-review.googlesource.com/c/platform/prebuilts/sdk/+/1850356

Change-Id: Ic7b0242c9c3f3c334952b3015f539d6889bc5a11