Revert D28331386: [pytorch][PR] [torch/elastic] Update the rendezvous docs
Test Plan: revert-hammer
Differential Revision:
D28331386 (https://github.com/pytorch/pytorch/commit/e4418b67c7b3e789b3fb769cec50c5263c9aec9c)
Original commit changeset: 95dd32146222
fbshipit-source-id: 5522d4a09bc06ac42943eec9aa8bf5292cc778b2
