docs: fix code block language (#72839)
## Summary
Change `jsx` to `diff` in
[next-dynamic-api-wrong-context](https://github.com/vercel/next.js/blob/canary/errors/next-dynamic-api-wrong-context.mdx)
error page.
### Improving Documentation
- [x] Run `pnpm prettier-fix` to fix formatting issues before opening
the PR.
- [x] Read the Docs Contribution Guide to ensure your contribution
follows the docs guidelines:
https://nextjs.org/docs/community/contribution-guide
Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>
