Clarify that 5-D 'bilinear' grid_sample is actually trilinear (#45090)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/41528
Pull Request resolved: https://github.com/pytorch/pytorch/pull/45090
Reviewed By: ailzhang
Differential Revision: D23841046
Pulled By: zou3519
fbshipit-source-id: 941770cd5b3e705608957739026e9113e5f0c616
