docs: updated dynamic page to show an example url (#1370)

docs/content/3.docs/2.directory-structure/9.pages.md

@@ -38,6 +38,12 @@ Given the example above, you can access group/id within your component via the `
 </template>
 ```
 
+Navigating to `/users-admins/123` would render:
+
+```
+admins 123
+```
+
 ## Nested Routes
 
 We provide a semantic alias for `RouterView`, the `NuxtChild` component, for displaying the children components of a [nested route](https://next.router.vuejs.org/guide/essentials/nested-routes.html).