Update _torch_docs.py (#51212)
Summary:
Fix `torch.linalg.qr` reference where it's desired to render fully-qualified name into docs.
Suggested fix for https://github.com/pytorch/pytorch/pull/47764/files#r565368195
Pull Request resolved: https://github.com/pytorch/pytorch/pull/51212
Reviewed By: ezyang
Differential Revision: D26142496
Pulled By: ailzhang
fbshipit-source-id: 052b2085099baa372e3b515b403f25d23cf50785
