Classification metrics section: examples of input types

Documentation file: https://github.com/Lightning-AI/metrics/blob/v0.10.2/docs/source/pages/classification.rst
For binary inputs target, the example used was: ```binary_target = torch.tensor([1, 0, 2])```, while for binary I believe there should be no more than 2 different integers. So it should be ```binary_target = torch.tensor([1, 0, 1])```