docs: reference links to serialization.html (#54659)
Summary:
fixes https://github.com/pytorch/pytorch/issues/54311
https://11811979-65600975-gh.circle-artifacts.com/0/docs/generated/torch.save.html
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54659
Reviewed By: ailzhang
Differential Revision: D27328281
Pulled By: zou3519
fbshipit-source-id: b88d02e5407238a338d537d013a297ae9cdf922b
