docs(@vant/use): add usePageVisibility doc

packages/vant-use/src/useClickAway/README.zh-CN.md

@@ -57,15 +57,15 @@ export default {
 ## 类型定义
 
 ```ts
-type Options = {
-  eventName?: string;
-};
-
 function useClickAway(
   target: Element | Ref<Element>,
   listener: EventListener,
   options?: Options
 ): void;
+
+type Options = {
+  eventName?: string;
+};
 ```
 
 ## 参数

packages/vant-use/src/useEventListener/README.zh-CN.md

@@ -33,17 +33,17 @@ export default {
 ## 类型定义
 
 ```ts
-type Options = {
-  target?: EventTarget | Ref<EventTarget>;
-  capture?: boolean;
-  passive?: boolean;
-};
-
 function useEventListener(
   type: string,
   listener: EventListener,
   options?: Options
 ): void;
+
+type Options = {
+  target?: EventTarget | Ref<EventTarget>;
+  capture?: boolean;
+  passive?: boolean;
+};
 ```
 
 ## 参数

packages/vant-use/src/usePageVisibility/README.zh-CN.md

@@ -0,0 +1,36 @@
+# usePageVisibility
+
+获取页面的可见状态。
+
+## 代码演示
+
+### 基本用法
+
+```js
+import { watch } from 'vue';
+import { usePageVisibility } from '@vant/use';
+
+export default {
+  setup() {
+    const pageVisibility = usePageVisibility();
+
+    watch(pageVisibility, (value) => {
+      console.log('visibility: ', value);
+    });
+  },
+};
+```
+
+## 类型定义
+
+```ts
+function usePageVisibility(): Ref<VisibilityState>;
+
+type VisibilityState = 'visible' | 'hidden';
+```
+
+## 返回值
+
+| 参数 | 说明 | 类型 | 默认值 |
+| --- | --- | --- | --- |
+| visibilityState | 页面当前的可见状态，`visible` 为可见，`hidden` 为隐藏 | _Ref<VisibilityState>_ | - |