- new sentence, new line

ok deraadt@

o) always close .Bl tags;
o) fix usage of .Xr;
millert@ ok

o) .Sh AUTHOR -> .Sh AUTHORS;
o) We don't like .Pp before/after .Sh;
o) We don't like .Pp before/after .Rs/.Re;
o) NetBSD -> .Nx;
o) OpenBSD -> .Ox;
millert@ ok

* except when it is escaped with a `\' at the end of the line
- fix remaining .Nm usage as well
- this is from a patch I received from kwesterback@home.com, who has been
working on some scripts for fixing formatting errors in mdoc'd man pages
Ok, so there could be a cost/benefit debate with this commit, but since I have
the patch we might as well commit it...

it's not supposed to be a hyphen/dash

Out of the approximately 1450 man pages, only about 90 of them were wrong.
Thanks to kwesterback@home.com for coming up with a script and patch to repair
this. The patch also inserted a .Os macro in the few man pages that were
missing one.

Reviewed by: Theo

into libutil.
Obtained from: FreeBSD
Reviewed by: Theo