[pytorch] Small fix to docstring of FSDP.optim_state_dict_to_load (#108383)
Summary: Fix ordering of args in docstring
Test Plan: N/A
Differential Revision: D48889668
Pull Request resolved: https://github.com/pytorch/pytorch/pull/108383
Approved by: https://github.com/fegin, https://github.com/awgu, https://github.com/wz337
