[nsd-users] rewrite manpages to mdoc(7)

[Jan Stary]

> > The integration with the documentation is something
> > that you cannot easily achieve with neither man or medic formats.
> 
> I don't know what medic is, but html integration of mdoc(7) source
> is trivial with mandoc -Thtml, and perfectly doable with groff -Thtml,
> and has been for a long time. Stop the fud.

For example, the entirety of manpages.debian.org is done with that.