fix docker-compose download url (#994)

original code is a bad url with '404 NOT FOUND' return. 
fix docker-compose download url, add 'v' before docker-compose version

docSite/content/docs/development/docker.md

@@ -45,7 +45,7 @@ FastGPT 使用了 one-api 项目来管理模型池，其可以兼容 OpenAI 、A
 curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun
 systemctl enable --now docker
 # 安装 docker-compose
-curl -L https://github.com/docker/compose/releases/download/2.20.3/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
+curl -L https://github.com/docker/compose/releases/download/v2.20.3/docker-compose-`uname -s`-`uname -m` -o /usr/local/bin/docker-compose
 chmod +x /usr/local/bin/docker-compose
 # 验证安装
 docker -v
@@ -191,4 +191,4 @@ docker-compose down
 docker-compose up -d
 ```
 
-4. 进入容器执行副本集合初始化（看上方）
\ No newline at end of file
+4. 进入容器执行副本集合初始化（看上方）