Classification metrics section: examples of input types

[hieuchi911]

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])

[github-actions]

Hi! thanks for your contribution!, great first issue!

[SkafteNicki]

Page was completly removed in this PR #1251 since the information was somewhat outdated. Instead the specifics of the expected shape are stated in the docs for each classification metric.
See for example:
https://torchmetrics.readthedocs.io/en/latest/classification/accuracy.html#binaryaccuracy
Closing issue.