fixing trapezoid() comments for clarity (#64592)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/64592
cc mruberry rgommers heitorschueroff
Test Plan: Imported from OSS
Reviewed By: mrshenli
Differential Revision: D30785663
Pulled By: NivekT
fbshipit-source-id: e968687fbb83a59bb46ce6858c6caafa5aa04412
