am 94e939e8: Merge "Improve Sensors documentation a bit" into gingerbread

Merge commit '94e939e8794727f4f74839de23c5ac5f0d9f84b3' into gingerbread-plus-aosp

* commit '94e939e8794727f4f74839de23c5ac5f0d9f84b3':
  Improve Sensors documentation a bit