fix(current-user): use correct backend endpoint (#1637)

Co-authored-by: victoria <[email protected]>

docs/references/nextjs/current-user.mdx

@@ -8,7 +8,7 @@ The `currentUser` helper returns the [`Backend User`](/docs/references/backend/t
 Under the hood, this helper:
 
 - calls `fetch()`, so it is automatically deduped per request.
-- uses the `GET /v1/users/me` endpoint.
+- uses the [`GET /v1/users/{user_id}`](https://clerk.com/docs/reference/backend-api/tag/Users#operation/GetUser) endpoint.
 - counts towards the [Backend API Request Rate Limit](/docs/backend-requests/resources/rate-limits#rate-limits).
 
 ```tsx {{ filename: 'app/page.tsx' }}