docs: fix config-snippet in adapter-vercel (#13394)

fixes sveltejs/svelte.dev#1122

Author: tomoam

documentation/docs/25-build-and-deploy/90-adapter-vercel.md

@@ -69,13 +69,12 @@ If your functions need to access data in a specific region, it's recommended tha
 You may set the `images` config to control how Vercel builds your images. See the [image configuration reference](https://vercel.com/docs/build-output-api/v3/configuration#images) for full details. As an example, you may set:
 
 ```js
-// @errors: 2300 2842 7031 1181 1005 1136 1128
 /// file: svelte.config.js
 import adapter from '@sveltejs/adapter-vercel';
 
 export default {
 	kit: {
-		adapter({
+		adapter: adapter({
 			images: {
 				sizes: [640, 828, 1200, 1920, 3840],
 				formats: ['image/avif', 'image/webp'],