Update README.md

Author: lisong

docker/README.md

@@ -45,11 +45,11 @@ $ cd code-push-server/docker
 $ vim docker-compose.yml
 ```
 
-*将`DOWNLOAD_URL`中`YOU_MACHINE_IP`替换成本机ip*
+*将`DOWNLOAD_URL`中`YOU_MACHINE_IP`替换成本机外网ip或者域名*
 
-*将`MYSQL_HOST`中`YOU_MACHINE_IP`替换成本机ip*
+*将`MYSQL_HOST`中`YOU_MACHINE_IP`替换成本机内网ip*
 
-*将`REDIS_HOST`中`YOU_MACHINE_IP`替换成本机ip*
+*将`REDIS_HOST`中`YOU_MACHINE_IP`替换成本机内网ip*
 
 ## jwt.tokenSecret修改