Renamed CosineAnnealingLr to CosineAnnealingLR (#23242)
Summary:
fixing https://github.com/pytorch/pytorch/issues/23160
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23242
Differential Revision: D16443348
Pulled By: pbelevich
fbshipit-source-id: af0edf4e841e04a8016c98bfee72696581f3f070
