Add java-only upload step to maintainer docs
Add java-only upload step to maintainer docs

Summary: Per title

Reviewed By: dreiss

Differential Revision: D18246637

fbshipit-source-id: 4c1edfd465bcbdf29f1f3fc58b30f1da8cab55a2

facebookincubator/fbjni,facebookincubator/fbjni,facebookincubator/fbjni,facebookincubator/fbjni