view .arcconfig @ 45165:01c4dccfd6b5

mergestate: rename a helpless variable name to bit helpful one

The old variable name `r` makes it ~impossible to understand what does it mean.
One can only understand that after going to callers and hoping that its
documented there.

I also documented return value of the function involved while I was there.

Differential Revision: https://phab.mercurial-scm.org/D8738

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