Apply suggestions from code review

.changeset/brown-pets-clean.md

@@ -4,4 +4,4 @@
 
 The astro middleware now runs when a matching page or endpoint is not found. Previously, a `pages/404.astro` or `pages/[...catch-all].astro` route had to match to allow middleware. This is now not necessary.
 
-Note that some adapters may need to update to let Astro's SSR code handle the not-found case.
+When a route does not match in SSR deployments, your adapter may show a platform-specific 404 page instead of running Astro's SSR code. In these cases, you may still need to add a `404.astro` or fallback route with spread params, or use a routing configuration option if your adapter provides one.