D4071: resolve: graduate resolve.mark-check from experimental, add docs

[spectral (Kyle Lippincott)]

spectral added inline comments.

INLINE COMMENTS

> pulkit wrote in config.txt:452
> I think here you mean 'none'?

No, I didn't document the ``none`` case explicitly.  This is saying that "even if it's going to abort, adding --all will bypass the error" (this is part of the hint when it aborts, so maybe it's not useful to mention here?)

Should I remove this last sentence?

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D4071

To: spectral, #hg-reviewers
Cc: pulkit, mercurial-devel