Fix kinit.1's synopsis w.r.t. -f and -F.
Fix kinit.1's synopsis w.r.t. -f and -F.

madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal,madscientist159/heimdal