manuals: Misc syntax fixes

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

The rendered output (in ascii and html) is not affected by this commit.

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/1459

(cherry picked from commit 229381deb270e8e240d20b572c63234a61cbd977)