am 5a93032d: doc change: resolved conflicts for merge of 3c691a8d to gingerbread

Merge commit '5a93032dcbe54223e03102d497d7e04370491737' into gingerbread-plus-aosp

* commit '5a93032dcbe54223e03102d497d7e04370491737':
  Doc change: add notes for ndk r4b.