Add further info to `masked_scatter` and `masked_scatter_` documention (#94545)
Fixes #94353
This PR adds examples and further info to the in-place and out-of-place masked scatter functions' documentation, according to what was proposed in the linked issue. Looking forward to any suggested changes you may have as I continue to familiarize myself with PyTorch 🙂
Pull Request resolved: https://github.com/pytorch/pytorch/pull/94545
Approved by: https://github.com/lezcano
