docker: further clariried docs
docker: further clariried docs

JS-Wang/ONL,shengzhou/ONL,iamyaw/ONL,JS-Wang/ONL,jeankuo/ONL,InterfaceMasters/ONL,capveg/ONL,audihsu-qci/ONL,capveg/ONL,InterfaceMasters/ONL,audihsu-qci/ONL,iamyaw/ONL,shengzhou/ONL,jeankuo/ONL