Previously on FreeBSD/mandoc (probably affecting others), everything
except xkbcli was being listed twice and wrapping on standard console
in apropos because mdoc(7) names should not have spaces or be different
than the title.

Further, xkb is already parsed in search results by being in the name,
so expand xkb to "X keyboard" so that they match for apropos keyboard.
We did this already in xkbutils, which matches setxkbmap.

These don't need to be quoted literals, and - doesn't need to be escaped,
but I left them because there may be environments which are not to spec,
but I'm happy to ammend this commit if that cleanup seems desirable.

Co-authored-by: Ran Benita <ran@unusedvar.com>