pytorch

5f3f327a - update `SequentialLR` signature (#69817)

update `SequentialLR` signature (#69817) Summary: - ~optimizer isn't required for `SequentialLR` since it's already present in the schedulers. Trying to match the signature of it with `ChainedScheduler`.~ - ~`verbose` isn't really used anywhere so removed it.~ updated missing docs and added a small check Pull Request resolved: https://github.com/pytorch/pytorch/pull/69817 Reviewed By: ngimel Differential Revision: D33069589 Pulled By: albanD fbshipit-source-id: f015105a35a2ca39fe94c70acdfd55cdf5601419