标记
可以使用标记来标记文档的内容，默认标记为蓝色
Default label
Blue label
Stable
New release
Coming soon
Deprecated
Default label
{: .label }
Blue label
{: .label .label-blue }
Stable
{: .label .label-green }
New release
{: .label .label-purple }
Coming soon
{: .label .label-yellow }
Deprecated
{: .label .label-red }