pytorch

12a1df27 - `scatter_reduce` documentation (#68580)

`scatter_reduce` documentation (#68580) Summary: Fixes https://github.com/pytorch/pytorch/issues/63780 (part 2) Pull Request resolved: https://github.com/pytorch/pytorch/pull/68580 Reviewed By: atalman Differential Revision: D33800694 Pulled By: malfet fbshipit-source-id: 2e09492a29cef115a7cca7c8209d1dcb6ae24eb9 (cherry picked from commit 696ff7594059b8b61f93475da7af7b197829061f)