[pytorch] Update docstring for FSDP.set_state_dict_type (#103864)
Summary: I noticed optim_state_dict_config was missing from the Args section
Test Plan: N/A
Reviewed By: rohan-varma
Differential Revision: D46670165
Pull Request resolved: https://github.com/pytorch/pytorch/pull/103864
Approved by: https://github.com/rohan-varma, https://github.com/fegin, https://github.com/fduwjj
