[Docs] Mention `torch.bfloat16` in `torch.finfo` (#68496)
Summary:
https://pytorch.org/docs/master/type_info.html#torch.torch.finfo seems to miss `torch.bfloat16`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68496
Reviewed By: mruberry
Differential Revision: D32538806
Pulled By: ngimel
fbshipit-source-id: 1296b3eb34d024cfc7d85cf53efe771ee9f98ea2
