Revert D33800694: [pytorch][PR] `scatter_reduce` documentation
Test Plan: revert-hammer
Differential Revision:
D33800694 (https://github.com/pytorch/pytorch/commit/12a1df27c73f05b8bfba72d68ac8f75f4e81dc35)
Original commit changeset: 2e09492a29ce
Original Phabricator Diff: D33800694 (https://github.com/pytorch/pytorch/commit/12a1df27c73f05b8bfba72d68ac8f75f4e81dc35)
fbshipit-source-id: 2a4775c0042551607fe3ab77f5bfe9f2e4b6b78e
(cherry picked from commit 4bd6c0d2bbc8180d44db2266cdad6d7b030a6dbf)
