.arcconfig

revlog: update the docstring of `ancestors` to match reality

Code using this method expect the revision to be (reverse) sorted. As pointed by
Yuya Nishihara, the docstring should reflect that.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}