fix typo "normal" -> "Cauchy" (#40334)
Summary:
just looks like a real simple typo
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40334
Reviewed By: ezyang
Differential Revision: D22195107
Pulled By: zou3519
fbshipit-source-id: 6c43842d22cbc15db2307976381f6dc1536b5047
