am 7b0463a9: am ed2a70d6: docs: add the Bluetooth developer guide, and make some revisions to the BT javadocs

Merge commit '7b0463a949b57620680b95e45c66a05f67426b74' into eclair-mr2-plus-aosp

* commit '7b0463a949b57620680b95e45c66a05f67426b74':
  docs: add the Bluetooth developer guide,