Fix reference to OpenNextConfig type in streaming example (#59)

Author: leanderiversen

pages/aws/config/simple_example.mdx

@@ -22,7 +22,7 @@ Here you can find the most common `open-next.config.ts` file examples that you c
 </Callout>
 
 ```ts
-import type { OpenNextConfig } from '@opennextjs/aws/types/open-next.ts';
+import type { OpenNextConfig } from '@opennextjs/aws/types/open-next.js';
 const config = {
   default: {
     override: {