cac(4): Xr bio(4) and friends, and mention when it was first introduced

Convert TNF licenses to new 2 clause variant

Remove authors section, and update history where appropriate.

The correct capitalisation of 'NetBSD.org' is (you
guessed it) 'NetBSD.org'.

some mdoc fixes.

Edit -mdoc usage.

* There is no -indent option to .Bd or .Bl, although you would
never know that from its frequent use in this tree. There is a
"-offset indent" combination that makes sense, and

Edit -mdoc usage.

* There is no -indent option to .Bd or .Bl, although you would
never know that from its frequent use in this tree. There is a
"-offset indent" combination that makes sense, and you can certainly
say "-width indent".

* Also, you can't markup the -width option argument, tho you CAN
use a callable macro. So "-width Ar filename" doesn't make sense,
but either "-width Ar" or "-width filename" does, as might something
like "-width xxfilename" for a little extra space.

* There are a lot of needlessly complex hanging tag macros in man4 used
to create simple item lists. Those should be simplified one of these
days before someone copies and edits yet another man4 page.

show more ...

Sort sections, sort SEE ALSO, remove some unnecessary .Pp, and some
other fixes.

Boring whitespace fixes.

Use standard section headers; uppercase .Sh argument; remove quotes in
.Sh arguments.

lsu -> ld, by popular request.

- ca -> lsu
- Document twe.

Document recent changes.

- Formatting.
- Reword slightly to be more clear in one or two cases.

Note some 'bugs'.

Documentation for cac/ca devices.