docker: fixed typo and added additional clarification
docker: fixed typo and added additional clarification

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