.arcconfig

nodemap: document the docket attributes

More documentation rarely hurts.

Differential Revision: https://phab.mercurial-scm.org/D8182

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