am 6652ef46: am dd55de3d: am 9767f9e2: am 7df86ef4: am 9e36f588: Merge "update storage doc for secondary external storage in KK and add some new sample code and remove documentation for APIs below level 8 and add information about permission changes in KK bug: 1190750

* commit '6652ef463dd7976f522dac7fca5be06e11188cd4':
  update storage doc for secondary external storage in KK and add some new sample code and remove documentation for APIs below level 8 and add information about permission changes in KK bug: 11907502