ammend tensors.rst and torch.rst for doc generation (#69030)
Summary:
(This is my first contribution to PyTorch) Added missing operations to docs added in https://github.com/pytorch/pytorch/issues/64430. Please let me know if I've done anything wrong.
Fixes https://github.com/pytorch/pytorch/issues/68928
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69030
Reviewed By: samdow
Differential Revision: D32706826
Pulled By: soulitzer
fbshipit-source-id: edcc175a8f9bc69450a39059580c05edce699312
