docs issue at: 缓动系统——示例代码括号不匹配

**filePath:** [zh/tween/index.md](https://github.com/cocos/cocos-docs/blob/master/versions/3.8/zh/tween/index.md)
**content:** 

<img width="1088" height="303" alt="Image" src="https://github.com/user-attachments/assets/cb49cdc2-5cc0-4d35-924e-c421e1b192ba" />