Move link examples to only Pages Router docs. (#57758)

Author: leerob

docs/02-app/02-api-reference/01-components/link.mdx

@@ -5,6 +5,8 @@ description: Enable fast client-side navigation with the built-in `next/link` co
 
 {/* The content of this doc is shared between the app and pages router. You can use the `<PagesOnly>Content</PagesOnly>` component to add content that is specific to the Pages Router. Any shared content should not be wrapped in a component. */}
 
+<PagesOnly>
+
 <details>
   <summary>Examples</summary>
 
@@ -13,6 +15,8 @@ description: Enable fast client-side navigation with the built-in `next/link` co
 
 </details>
 
+</PagesOnly>
+
 `<Link>` is a React component that extends the HTML `<a>` element to provide [prefetching](/docs/app/building-your-application/routing/linking-and-navigating#1-prefetching) and client-side navigation between routes. It is the primary way to navigate between routes in Next.js.
 
 <AppOnly>