Fix #17218 by updating documentation (#17258)
Summary:
Fix Issue #17218 by updating the corresponding documentation in [BCEWithLogitsLoss](https://pytorch.org/docs/stable/nn.html#torch.nn.BCEWithLogitsLoss)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17258
Differential Revision: D14157336
Pulled By: ezyang
fbshipit-source-id: fb474d866464faeaae560ab58214cccaa8630f08
