Markdown render error

- [ ] I have searched the [issues](https://github.com/antvis/f2/issues) of this repository and believe that this is not a duplicate.

### Reproduction link
[https://f2.antv.vision/zh/docs/api/chart/pie-label](https://f2.antv.vision/zh/docs/api/chart/pie-label)

### Steps to reproduce
PieLabel 页面中间一部分的 Markdown 语法错误导致页面显示错误。全局搜索“设置被激活图形的显示样式”即可

| Environment | Info |
|---|---|
| f2 | 3.8.1 |
| System | mac |
| Browser | - |

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提 bug 的网站 https://antv-issue-helper.surge.sh/ 必须科学上网才可以打开。。

Open the PieLabel page at the linked reproduction URL and search for “设置被激活图形的显示样式” to locate the malformed Markdown. Correct the Markdown syntax so that the affected section renders properly, then verify the page displays without the reported error.

Written by the indexing model from the issue text.