Specific FAQ about approvals for PRs automated system

[oxinabox]

It may be worth clarifying that if a PR is made by an automated system, e.g. CompatHelper.
Then that system is the "author" of the PR.
And thus it needs review only from someone with merge rights.
Even if it is a automated system that that person triggered directly/manually.
As long as the system itself is well tested and good.

[oxinabox]

we should also include some statement about simple changes, like rebasing said PR,
or things that don't meaningfully change the code.

[ChrisRackauckas]

agreed