Fix ringo/promise API docs.
Fix ringo/promise API docs.

oberhamsi/ringojs,Transcordia/ringojs,ringo/ringojs,ashwinrayaprolu1984/ringojs,ringo/ringojs,oberhamsi/ringojs,ashwinrayaprolu1984/ringojs,ashwinrayaprolu1984/ringojs,Transcordia/ringojs,Transcordia/ringojs,ringo/ringojs,oberhamsi/ringojs,ashwinrayaprolu1984/ringojs,Transcordia/ringojs,ringo/ringojs