aaudio: clarify autodocs

These docs apply to O and P release.

Say POWER_SAVING not supported on input.
Emphasize that error callback should not stop or close directly.
Fix some incorrect function names in comments.

Bug: 62291775
Bug: 72036879
Test: read the autodocs to see if they make sense
Change-Id: Id03a7733735b856499dd944eb9e3c1523f8b6650