GitLab

The default was changed in
https://chromium-review.googlesource.com/c/chromium/src/+/1965952, but I
forgot the admin policy documentation also needs updating.

Bug: 996894
Change-Id: Ib6ddd9a91e0812662a46125c377ab7486180c447
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1974578
Commit-Queue: David Benjamin <davidben@chromium.org>
Auto-Submit: David Benjamin <davidben@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726432}