[Checkpoint] Fix checkpoint test test_fsdp_optim_state.py

[wz337]

This PR:

1. Fix the test/distributed/fsdp/test_fsdp_optim_state.py according to change in FSDP.flatten_sharded_optim_state_dict() API.
2. Update docstring accordingly.

[pytorch-bot]

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[fegin]

Thanks for the fix!

[wz337]

@pytorchmergebot merge

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[wz337]

@pytorchmergebot rebase

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[pytorchmergebot]

Successfully rebased fix_test_fsdp_optim_state.py onto refs/remotes/origin/viable/strict, please pull locally before adding more changes (for example, via git checkout fix_test_fsdp_optim_state.py && git pull --rebase)

[wz337]

@pytorchmergebot merge

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Merge started

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