unfinishedstate: suggested `hg update .` (including `.`) to complete update
`hg update` can update to a different and undesired commit. For users
who have commands.update.requiredest=yes, it's even an error to run
just `hg update.
Differential Revision: https://phab.mercurial-scm.org/D6956
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init
$ echo 'base' > base
$ hg ci -Ambase
adding base
$ hg qnew -mmqbase mqbase
$ hg qsave
$ hg qrestore 2
restoring status: hg patches saved state