Revert D29794958: [pytorch][PR] changing trapz to trapezoid
Test Plan: revert-hammer
Differential Revision:
D29794958 (https://github.com/pytorch/pytorch/commit/95cec8f4fa889663d3a9869590f2b8fc052bbb6c)
Original commit changeset: 60b9c07efd47
fbshipit-source-id: 2dcda2d62e01c2521a86ae5ed8246cfb686d3f64
