Add version disclaimer to jiti docs (#298)

Co-authored-by: Julius Marminge <[email protected]>

docs/src/app/docs/nextjs/page.mdx

@@ -114,7 +114,7 @@ import { fileURLToPath } from "node:url";
 import createJiti from "jiti";
 const jiti = createJiti(fileURLToPath(import.meta.url));
 
-// Import env here to validate during build. Using jiti we can import .ts files :)
+// Import env here to validate during build. Using jiti@^1 we can import .ts files :)
 jiti("./app/env");
 
 /** @type {import('next').NextConfig} */
@@ -123,6 +123,8 @@ export default {
 };
 ```
 
+We do not recommend using `next.config.ts` as it does not support loading ESM. 
+
 ### Use your schema
 
 Then, import the `env` object in your application and use it, taking advantage of type-safety and auto-completion: