rewriteutil: point to help about instability when rewriting creates orphan
This replicates the message from the evolve extension.
Differential Revision: https://phab.mercurial-scm.org/D10517
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}