docker compose 方式部署harbor 的文档优化， 请支持docker syslog方式

root@serv07:~/harbor# docker-compose up
harbor-log is up-to-date
registry is up-to-date
harbor-db is up-to-date
registryctl is up-to-date
redis is up-to-date
harbor-core is up-to-date
harbor-jobservice is up-to-date
harbor-portal is up-to-date
nginx is up-to-date
Attaching to harbor-log, registry, harbor-db, registryctl, redis, harbor-core, harbor-jobservice, harbor-portal, nginx
registry       | WARNING: no logs are available with the 'syslog' log driver
harbor-db      | WARNING: no logs are available with the 'syslog' log driver
registryctl    | WARNING: no logs are available with the 'syslog' log driver
redis          | WARNING: no logs are available with the 'syslog' log driver
harbor-core    | WARNING: no logs are available with the 'syslog' log driver
harbor-jobservice | WARNING: no logs are available with the 'syslog' log driver
harbor-portal  | WARNING: no logs are available with the 'syslog' log driver
nginx          | WARNING: no logs are available with the 'syslog' log driver