[FEATURE] Documentation about new audio subsystem improvements

### Is your feature request related to a problem? Please describe.

PR #18348 improved the audio subsystem, but after that the current Documentation is outdated.

In order to avoid delaying the PR merge and to avoid tensions like we saw recently in github and mailing list, I decided to open this PR to let the author to take care o if

### Describe the solution you'd like

Update the Documentation to reflect the new APIs and ioctls

### Describe alternatives you've considered

_No response_

### Verification

- [x] I have verified before submitting the report.

Start by reviewing PR #18348 to understand the audio subsystem improvements, new APIs, and ioctls it introduced. Locate the existing audio documentation that describes those interfaces, then update it so the documented APIs and ioctls match the changes in the PR. Done means the documentation reflects the new subsystem behavior without leaving the current material outdated.

Written by the indexing model from the issue text.