add missing align_corners annotation (#32492)
Summary:
adds the missing annotation in grid_sample and affine_grid functional
Pull Request resolved: https://github.com/pytorch/pytorch/pull/32492
Differential Revision: D19516550
Pulled By: ezyang
fbshipit-source-id: 064c8c99bf6eae6744237c0b151b3ce4c82ada96
