添加 version: "3" 过时警告到 docker-compose.md

[bbb-lsy07]

Release Note

• 变更：在 docker-compose.md 中添加警告，提示 version: "3" 在 Docker Compose 2.0+ 中已过时，运行 docker-compose up -d 时可能出现警告。
• 影响：提高用户对最新 Docker Compose 版本兼容性的认识，未修改现有代码，仅优化文档。

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[bbb-lsy07]

/retitle

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