[docs] clarify sequence usage (#3568)

Author: benmccann

documentation/docs/05-modules.md

@@ -95,13 +95,23 @@ This module provides a helper function to sequence multiple `handle` calls.
 import { sequence } from '@sveltejs/kit/hooks';
 
 async function first({ event, resolve }) {
-	console.log('first');
-	return await resolve(event);
+	console.log('first pre-processing');
+	const result = await resolve(event);
+	console.log('first post-processing');
+	return result;
 }
 async function second({ event, resolve }) {
-	console.log('second');
-	return await resolve(event);
+	console.log('second pre-processing');
+	const result = await resolve(event);
+	console.log('second post-processing');
+	return result;
 }
 
 export const handle = sequence(first, second);
 ```
+
+The example above would print:
+>first pre-processing
+>second pre-processing
+>second post-processing
+>first post-processing