Revert D35045122: [Easy][FSDP] Minor doc fixes
Test Plan: revert-hammer
Differential Revision:
D35045122 (https://github.com/pytorch/pytorch/commit/15275eb5a9c74cfc1daeda9165be2518036868f5)
Original commit changeset: 701181cfdb93
Original Phabricator Diff: D35045122 (https://github.com/pytorch/pytorch/commit/15275eb5a9c74cfc1daeda9165be2518036868f5)
fbshipit-source-id: d826c32a5860385d5c5b21a0502326340aeb4dfb
(cherry picked from commit 48c3ba1828a8067c4107db7193058f0f2a3af725)
