Improve picking-a-router.md code snippet (remix-run#9507)

Author: willemarcel

contributors.yml

@@ -136,6 +136,7 @@
 - vijaypushkin
 - vikingviolinist
 - vishwast03
+- willemarcel
 - williamsdyyz
 - xavier-lc
 - xcsnowcity

docs/routers/picking-a-router.md

@@ -31,6 +31,8 @@ The easiest way to quickly update to a v6.4 is to get the help from [`createRout
 ```jsx
 import {
   createBrowserRouter,
+  createRoutesFromElements,
+  Route,
   RouterProvider,
 } from "react-router-dom";