docs: expose at::native::unfold (#74224)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/74091
Pull Request resolved: https://github.com/pytorch/pytorch/pull/74224
Reviewed By: zou3519
Differential Revision: D34895555
Pulled By: H-Huang
fbshipit-source-id: 201ffa76681f6940eb8f180409f4e94974ae3e4f
(cherry picked from commit e0f8461d8990e951fb2c1585c871125c9dd3da29)
