Inline module documentation project update

Wow, impressive weekend everyone.

Thanks to everyone who helped document modules. We should probably
now review the generated output to make sure everything looks ok.

I have the docs on 'fireball' to write when fireball is done, and I
see there are only two modules left -- "async_status" and "nagios".

Assuming someone is doing Nagios documentation conversion (Tim
perhaps?), I'll get async_status and fireball in due course.

Once done, "make manpages" and "make docs" will raise an error
whenever a core module is missing the DOCUMENTATION
string.

Thanks everyone! This will make it much easier to keep module
documentation up to date.

--Michael