docs: change `bumped` references to `phase-divergent`
Per https://www.mercurial-scm.org/wiki/CEDVocabulary
# setup config and various utility to test new heads checks on push.$TESTDIR/testlib/common.shcat>>$HGRCPATH<<EOF[ui]# simpler log outputlogtemplate ="{node|short} ({phase}): {desc}\n"[phases]# non publishing serverpublish=False[extensions]# we need to strip some changeset for some test casesstrip=evolve=EOFsetuprepos(){echocreatingbasicserverandclientrepohginitservercdservermkcommitroothgphase--public.mkcommitA0cd..hgcloneserverclient}