docs: fix respondWith event object (#775)

Author: iiio2

docs/1.guide/4.event.md

@@ -101,18 +101,18 @@ You must craft a response using the [`Response`](https://developer.mozilla.org/e
 > Prefer explicit `return` over `respondWith` as best practice.
 
 > [!IMPORTANT]
-> A `responseWith` call will **always** take precedence over the returned value, from current and next event handlers. If there is no returned value, the request will continue until the end of the stack runner.
+> A `respondWith` call will **always** take precedence over the returned value, from current and next event handlers. If there is no returned value, the request will continue until the end of the stack runner.
 
 **Example:**
 
 ```js
-defineEventHandler((event) => {
+defineEventHandler(async(event) => {
   await event.respondWith(new Response("Hello World"));
   return "..."; // DOES NOT WORKS
 });
 
 app.use(
-  defineEventHandler((event) => {
+  defineEventHandler(async(event) => {
     await event.respondWith(new Response("Hello World"));
     return "..."; // DOES NOT WORK
   }),