Docs: Export store in TS guide (#991)

Author: msutkowski

docs/tutorials/typescript.md

@@ -47,7 +47,7 @@ Since those are types, it's safe to export them directly from your store setup f
 import { configureStore } from '@reduxjs/toolkit'
 // ...
 
-const store = configureStore({
+export const store = configureStore({
   reducer: {
     posts: postsReducer,
     comments: commentsReducer,