Tensor docs (#63308)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/62146.
Modernizes and clarifies the documentation of torch.tensor and torch.as_tensor, highlighting the distinction in their copying behavior and preservation of autograd history.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63308
Reviewed By: albanD, ngimel
Differential Revision: D30338025
Pulled By: mruberry
fbshipit-source-id: 83a0c113e4f8fce2dfe086054562713fe3f866c2
