multimail: fix a few simple spelling errors
Also submitted upstream as:
https://github.com/git-multimail/git-multimail/pull/208
Reported-by: Jens Schleusener <Jens.Schleusener@fossies.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
authored by