Add some missing font resets.
Take out a couple unnecessary comments; there are the only inline roff
comments in the file, so this avoids having to worry about them
wholesale.
Cleanup trailing whitespace in the manpage source.
Correct a number of places where the font variant should be being
restored, but is instead swapped to another variant accidentally.
Probably from a typo one place that got C&P'd all over the place, 'cuz
how else can you write roff and keep sane?
Add missing \fP on the f.setpriority line.  Technically this is
unnecessary, but it makes conversion simpler.