manuals: Misc syntax fixes

These were reported by mandoc -T lint ... as errors.

Signed-off-by: Graham Percival <gperciva@tarsnap.com>
Reviewed by: mhorne
MFC after: 3 days
Sponsored by: Tarsnap Backup Inc.
Pull Request: https://github.com/freebsd/freebsd-src/pull/1453

(cherry picked from commit 8b92fa1ceb95bbe80b473fc35d4276146201e802)