AudioAttributes docs: warn about small buffer size with FLAG_LOW_LATENCY

Explain buffer size optimization.

This CL has no code changes, just documentation changes.

Bug: 28802853
Change-Id: I91942f00a3e9691e4fc05b24656b8bf4cb538bc2
Signed-off-by: Phil Burk <philburk@google.com>
1 file changed