githelp: recommend `hg import` for `git am`
This referenced a third party extension. It doesn't feel appropriate
to do that from a core extension. Reference `hg import` instead.
Differential Revision: https://phab.mercurial-scm.org/D1724
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}