Android 9.0.0 release 19
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hwc2: Fix readback docs

Fixes a couple of problems with the return codes in the readback
documentation and adds a paragraph of clarification about when
getReadbackBufferAttributes will be called.

Bug: 67048889
Test: N/A, doc fix only
Change-Id: I3ea1a6993323f7ce12c36a377bf69e2866b18082
1 file changed