fix: update ButtonAsChild component to use "#" as the href value for …

…the Link element

apps/www/registry/default/example/button-as-child.tsx

@@ -5,7 +5,7 @@ import { Button } from "@/registry/default/ui/button"
 export default function ButtonAsChild() {
   return (
     <Button asChild>
-      <Link href="/login">Login</Link>
+      <Link href="#as-child">Login</Link>
     </Button>
   )
 }