Update links to point to HEAD

BUG=b:224796805
TEST=navigate to updated link and/or N/A

Change-Id: Iab178f486939620994a3e7840d9ac3bcaaea17c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/config/+/5158730


Reviewed-by: Jesse McGuire <jessemcguire@google.com>
Auto-Submit: Jonathon Murphy <jpmurphy@google.com>
Commit-Queue: Jesse McGuire <jessemcguire@google.com>