docs: update cases

Author: rudyxu1102

active-rfcs/0000-infer-attrs.md

@@ -67,10 +67,23 @@ So I propose to pass `attrs` type to the second params of `defineComponent`.
 The following blow is the design details.
 - `attrs` is inferred to `{ class: unknown; style: unknown }` when the value of the second param is `undefined`
 - `attrs` is lower priority  than `props`.
-
+- [see for more detail cases](https://github.com/vuejs/core/pull/7444/files)
 
 ## `useAttrs<T>`
-In the `setup-script`, the generic type of `useAttrs` will compile to the second param of `defineComponent`
+In the `setup-script`, the generic type of `useAttrs` will compile to the second param of `defineComponent`.
+```ts
+export default /*#__PURE__*/_defineComponent({
+  setup(__props, { expose }) {
+  expose();
+
+      const attrs = useAttrs<{ foo: number }>()
+
+return { attrs, useAttrs, ref }
+}
+
+}, { attrs: {} as { foo: number }})"
+```
+
 
 
 # Unresolved questions