GitLab

Clarifying documentation to make it clear that a disabled feature
does not necessarily result in Security_Impact-None.

Also, bringing note on Sheriffbot behavior up to date.

R=cthomp@chromium.org, nasko@chromium.org

Change-Id: I6073b579dc490e8dd67e0faf240ad8232cb58af4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829743
Commit-Queue: Adrian Taylor <adetaylor@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Christopher Thompson <cthomp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701288}