Correctly document ReduceLROnPlateau
📚 Documentation
It seems that torch.optim.lr_scheduler.ReduceLROnPlateau can not be used in configure_optimizers because scheduler.step() does not receive the loss, see #673, #98 and others.
However, it is used as an example: https://pytorch-lightning.readthedocs.io/en/latest/optimizers.html#learning-rate-scheduling
Furthermore, the required parameter optimizer is not passed in the example.