Fix typo in documentation (#34581)
Summary:
Update the parameter description of `total_steps` in `OneCycleLR`. References https://github.com/pytorch/pytorch/issues/34531
Pull Request resolved: https://github.com/pytorch/pytorch/pull/34581
Differential Revision: D20386306
Pulled By: albanD
fbshipit-source-id: f8b424a01760e8f5d4de5367b6c60fb342019689
