简化Callout 元数据: “pln”用法:> [!info|pln] The callout will render in a plain style > Content displays normally颜色 您还可以为简化 Callout 指定颜色.Callout 元数据: “plain-red”用法:> [!note|plain-red] The callout will render with a plain style > Its border and title will be red