docs: recommend <NuxtLayout> when migrating error.vue (nuxt#20690)

docs/7.migration/6.pages-and-layouts.md

@@ -24,7 +24,17 @@ You will also need to change how you define the layout used by a page using the
 
 1. Replace `<Nuxt />` with `<slot />`
 1. Use `definePageMeta` to select the layout used by your page.
-1. Move `~/layouts/_error.vue` to `~/error.vue`. See [the error handling docs](/docs/getting-started/error-handling).
+1. Move `~/layouts/_error.vue` to `~/error.vue`. See [the error handling docs](/docs/getting-started/error-handling). If you want to ensure that this page uses a layout, you can use [the `<NuxtLayout>` component](/docs/guide/directory-structure/layouts) directly within `error.vue`:
+
+   ```vue
+   <template>
+     <div>
+       <NuxtLayout name="default">
+         <!-- -->
+       </NuxtLayout>
+     </div>
+   </template>
+   ```
 
 ### Example: `~/layouts/custom.vue`