Add histogramdd to torch.rst (#68273)
Summary:
The `torch.histogramdd` operator is documented in `torch/functional.py` but does not appear in the generated docs because it is missing from `docs/source/torch.rst`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/68273
Reviewed By: cpuhrsch
Differential Revision: D32470522
Pulled By: saketh-are
fbshipit-source-id: a23e73ba336415457a30bae568bda80afa4ae3ed
