Ammending docs to include info on node version for v2

[udany]

I'm developping on payload 2 and faced an issue with require within getExternalFile after including the cloud-storage plugin, the only solution to which was upgrading node to version 23 (or 22 with type: "module").

I think this could be inlcuded in the docs somewhere so it doesn't demmand diggin around a closed issue, or perharps on cloud-storage docs (although that would affect any custom implementations for remote storage as well).