docs: fix spacing (#612)

Author: Rich-Harris

documentation/docs/30-add-ons/03-devtools-json.md

@@ -16,12 +16,13 @@ You can also prevent the web server from issuing a notice regarding the incoming
 import { dev } from '$app/environment';
 
 export function handle({ event, resolve }) {
-  if (dev && event.url.pathname === '/.well-known/appspecific/com.chrome.devtools.json') {
-    return new Response(undefined, { status: 404 });
-  }
-  
-  return resolve(event);
+	if (dev && event.url.pathname === '/.well-known/appspecific/com.chrome.devtools.json') {
+		return new Response(undefined, { status: 404 });
+	}
+
+	return resolve(event);
 }
+```
 
 ## Usage