docs: 修改文档错误

Author: wangxingkang

src/useFullscreen/index.mdx

@@ -10,7 +10,7 @@ import { Card, Button } from 'antd';
 import useFullScreen from './index';
 import useToggle from '../useToggle/index';
 
-# useModal
+# useFullScreen
 
 全屏Hooks