fsdp fix
# What does this PR do?
1. FSDP fix: Fixes https://github.com/huggingface/transformers/issues/18767. If this argument is not specified and ``module`` is on CPU, FSDP issues a warning mentioning that this argument can be specified for faster initialization.
_The documentation is not available anymore as the PR was closed or merged._<|||||>> Thanks for the fix! Can you expand a bit the description so that users going back to your PR understand what's happening?

Done, Thanks!
 