docs: improve classname typing (#7927)

src/notify/README.md

@@ -106,7 +106,7 @@ export default {
 | duration | Duration(ms), won't disappear if value is 0 | _number \| string_ | `3000` |
 | color | Message color | _string_ | `white` |  |
 | background | Background color | _string_ | - |
-| className | Custom className | _any_ | - |
+| className | Custom className | _string \| Array \| object_ | - |
 | onClick | Callback function after click | _Function_ | - |
 | onOpened | Callback function after opened | _Function_ | - |
 | onClose | Callback function after close | _Function_ | - |

src/notify/README.zh-CN.md

@@ -143,7 +143,7 @@ export default {
 | duration | 展示时长(ms)，值为 0 时，notify 不会消失 | _number \| string_ | `3000` |
 | color | 字体颜色 | _string_ | `white` |
 | background | 背景颜色 | _string_ | - |
-| className | 自定义类名 | _any_ | - |
+| className | 自定义类名 | _string \| Array \| object_ | - |
 | onClick | 点击时的回调函数 | _Function_ | - |
 | onOpened | 完全展示后的回调函数 | _Function_ | - |
 | onClose | 关闭时的回调函数 | _Function_ | - |