Revert D26246231: [FX] Edits after comprehensive pass over docs
Test Plan: revert-hammer
Differential Revision:
D26246231 (https://github.com/pytorch/pytorch/commit/c22bc4821d88d72a56626ad8c827edeac92619d3)
Original commit changeset: 8d6278a9fe1d
fbshipit-source-id: fdc83289f8fe7986bc02181eec55e4e72be2d812
