docs: update atomWithRefresh import path (#2961)

docs/utilities/resettable.mdx

@@ -176,7 +176,7 @@ Passing one or more arguments to `set` will call "write" function.
 Here's how you'd use it to implement an refresh-able source of data:
 
 ```js
-import { atomWithRefresh } from 'XXX'
+import { atomWithRefresh } from 'jotai/utils'
 
 const postsAtom = atomWithRefresh((get) =>
   fetch('https://jsonplaceholder.typicode.com/posts').then((r) => r.json()),