lslogins(1): skeleton for a new utility

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>
last: fix minor typos in the man page

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>
runuser: fix minor typos in the man page

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>
su: fix minor typos in the man page

Signed-off-by: Ondrej Oprala <ooprala@redhat.com>