[Button]button组件demo存在重复和hover样式问题

[kagol]

Version

latest

Vue Version

latest

Link to minimal reproduction

Step to reproduce

在以下Button组件的警示按钮demo中可以看到：
https://vue-devui.github.io/components/button/#警示按钮

What is expected

No response

What is actually happening

No response

Any additional comments (optional)

No response