docs: update staleTimes.mdx (#72967)
Fix mdx formatting.
Previously MDX was not formatted correctly. (see image - `prefetch=`)
https://nextjs.org/docs/app/api-reference/next-config-js/staleTimes
<img width="659" alt="Screenshot 2024-11-19 at 15 11 57"
src="https://github.com/user-attachments/assets/44f77fd4-657e-409a-9190-9430fd96d5f8">
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Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>
