am 453c6d44: add api level 9 \'since\' flag to docs

Merge commit '453c6d449b6469dde9aae6044dedfe3be0da76c5' into gingerbread-plus-aosp

* commit '453c6d449b6469dde9aae6044dedfe3be0da76c5':
  add api level 9 'since' flag to docs