fix import from effector in last code sample

Author: k3env

docs/api/create-router-controls.md

@@ -50,7 +50,7 @@ export const router = createHistoryRouter({
 Use it anywhere:
 ```ts
 // @/pages/register
-import { sample, cancelButtonPressed } from 'effector'
+import { sample, createEvent } from 'effector'
 
 import { controls } from '@/shared/routing'