Revert D28972444: [pytorch][PR] Document debugability features in torch.distributed
Test Plan: revert-hammer
Differential Revision:
D28972444 (https://github.com/pytorch/pytorch/commit/a9d28108175e626c14bcb2da0b78d88992fa96e7)
Original commit changeset: da5e8ee84f0d
fbshipit-source-id: 94d3b3b75ddec74ea5b2b76f6a7519dc921ee2a7
