DOC Fixes link in register_module_backward_hook (#61999)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/61580
Pull Request resolved: https://github.com/pytorch/pytorch/pull/61999
Reviewed By: saketh-are
Differential Revision: D29847397
Pulled By: albanD
fbshipit-source-id: 3d9e1a5abac82d658b4f1746ace73e2fecb41725
