am 89969d4c: Merge "Doc change: documentation for library projects in sdk." into froyo

Merge commit '89969d4cdaf7abbbf6d3fce86c274e7b79113e8d' into froyo-plus-aosp

* commit '89969d4cdaf7abbbf6d3fce86c274e7b79113e8d':
  Doc change: documentation for library projects in sdk.