cpuset{,_getaffinity,_getdomain}.2: fix SEE ALSO

Sort by manpage section, then sort entries alphabetically.

This makes the manpages make manlint clean.

MFC after: 1 week
Sponsored by: DellEMC Isilon

(cherry picked from commit 0c424c64f81c2c7c0ed2d6b72da9927d48b1c3dc)