am b6868d0: am 9b825aa: AI 148470: add documentation about aapt image op

Merge commit 'b6868d0048ec814e02ced35df6ad6e7b72389ca4'

* commit 'b6868d0048ec814e02ced35df6ad6e7b72389ca4':
  AI 148470: add documentation about aapt image optimization