Update documents.
- query_format has been mandatory (since at least Feb 2020).
- set_params has been replaced to set_format (since May 2019).

Fix various typos, etc

Add a description to close().
> Before call to this, halt_input and halt_output are called if necessary.

Describe about (existing) constraints on round_blocksize().

Make start_input/halt_input optional if the driver has no recording,
make start_output/halt_output optional if the driver has no playback.
And remove such never called functions.

Remove superfluous Pp.

Describe about get_props() properties.

Bump date.

Improve wording, add more formatting.

Update manpages respond to isaki-audio2 branch.

Mark up NULL with Dv.

Two minor fixes.
- 0 -> NULL.
- avoid K&R and sync with reality.

Correct function name.
freem is used to free memory allocated by allocm.

Sync prototypes with reality. These have been changed in 2011.

Move the audio specification to section 9 under audio_system.

Ok wiz@

Add the audio mixer specification to section 7 of the manual.
See posting on tech-kern - "NetBSD Audio Specification 2018."

Remove workaround for ancient HTML generation code.

Fix a typo in a function name. Found by Nat Sloss, thanks.
Fixes PR misc/46446.

update audio(9) docs for audiomp changes

Convert TNF licenses to new 2 clause variant

Grammar fix.

Wups, bump date.

It's mixer_ctrl_t, not mixer_ctl_t.

kills a few `caddr_t' occurences still present in manpage

running in emulated wizd mode, convert caddr_t to void *.