docs: Update incorrect import in request mocking example (#4527)

docs/guide/mocking.md

@@ -277,7 +277,7 @@ You can use it like below in your [setup file](/config/#setupfiles)
 ```js
 import { afterAll, afterEach, beforeAll } from 'vitest'
 import { setupServer } from 'msw/node'
-import { HttpResponse, graphql, rest } from 'msw'
+import { HttpResponse, graphql, http } from 'msw'
 
 const posts = [
   {