pytorch

4230132b - Added docs for context method mixins. Fixes issue #27365 (#28643)

Added docs for context method mixins. Fixes issue #27365 (#28643) Summary: Fixes https://github.com/pytorch/pytorch/issues/27365 . This PR: 1. Makes Context method docs available. 2. Links [Extending torch autograd](https://pytorch.org/docs/stable/notes/extending.html#extending-torch-autograd) notes to Context method docs. Pull Request resolved: https://github.com/pytorch/pytorch/pull/28643 Differential Revision: D18170089 Pulled By: albanD fbshipit-source-id: a1119ea8e2f8a71f0d1aadf416f2f98343aa9b7b