doc string fix for torch.cuda.set_rng_state_all (#40544)
Summary:
Fix https://github.com/pytorch/pytorch/issues/40239
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40544
Differential Revision: D22233989
Pulled By: ezyang
fbshipit-source-id: b5098357a3e0c50037f95ba0d701523d5dce2628
