docs: bring several man pages closer to standard formatting

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: bring a few more man pages closer to standard formatting

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>
docs: bring some more man pages closer to standard formatting

Signed-off-by: Benno Schulenberg <bensberg@justemail.net>