Apply suggestions from code review

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

.changeset/brown-pets-clean.md

@@ -2,6 +2,6 @@
 "astro": minor
 ---
 
-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.
+Allows middleware to run 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.
 
 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.