am 64fc8082: am 40057ce7: Document that stopPreview is not needed before takePicture.

Merge commit '64fc80823e1e954a419bdcb0a193e4c56a8da959' into eclair-mr2-plus-aosp

* commit '64fc80823e1e954a419bdcb0a193e4c56a8da959':
  Document that stopPreview is not needed before takePicture.