Avoid using arc land and suggest cleaning up commit
message from most ofr Phabricator tags like Summary,
Reviewers, Subscribers and Tags.
Suggest keeping Differential Revision and use
git commit --amend for that.
I didn't know we were documenting arc land, I think we should discourage it heavily instead.
This is creating commit message with a lot of cruft inside: all the Phabricator tags should be removed before pushing IMO.