Update audio playback/capture manifest definitions (bugfix)

[pieqq]

Description

Make it clearer what has_audio_playback and has_audio_capture stand for.

These two manifest entries have been there for a long time, but it was never clear what they meant exactly. This led to issues such as the recent #1329. By having a more clear definition, testers know whether or not they should set these manifest entries or not.

Resolved issues

Fix #1329

Documentation

Tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.25%. Comparing base (b672f33) to head (a576aca).
Report is 115 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1430   +/-   ##
=======================================
  Coverage   45.25%   45.25%           
=======================================
  Files         367      367           
  Lines       39131    39131           
  Branches     6617     6617           
=======================================
  Hits        17707    17707           
  Misses      20751    20751           
  Partials      673      673           

Flag	Coverage Δ
provider-base	18.71% <ø> (ø)

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[zongminl]

Looks good to me.