Fix `torch.finfo.bits` typo in stub (#58819)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/58818.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58819
Reviewed By: walterddr, malfet
Differential Revision: D28641587
Pulled By: ezyang
fbshipit-source-id: b19b519db43f2075c64f4f9ba922310f2561ca70
