docs: fix accessing custom props from child pages (#21977)

docs/3.api/2.components/2.nuxt-page.md

@@ -71,7 +71,7 @@ In addition, `NuxtPage` also accepts custom props that you may need to pass furt
 <NuxtPage :foobar="123" />
 ```
 
-For example, in above example, value of `foobar` will be available using `attrs.foobar`.
+For example, in the above example, the value of `foobar` will be available using `$attrs.foobar` in the template or `useAttrs().foobar` in `<script setup>`.
 
 ::ReadMore{link="/docs/guide/directory-structure/app"}
 ::