am bf900939: am 7e73a2ce: Merge "Improve SensorManager documentation" into gingerbread

Merge commit 'bf9009396b1cba1f99f65c0ea9f5ef8532df1ab6'

* commit 'bf9009396b1cba1f99f65c0ea9f5ef8532df1ab6':
  Improve SensorManager documentation