🐛 [Bug]: Button组件文档问题

[xingyan95]

Version

v1.0.0-beta.12

Vue Version

3.1.1

Link to minimal reproduction

https://vue-devui.github.io/components/button/

Step to reproduce

1. API列表中，没有showLoading的说明。

What is expected

修正文档中存在的问题

What is actually happening

No response

Any additional comments (optional)

No response