Fix error message for scatter reduction (#46397)
Summary:
Follow up to https://github.com/pytorch/pytorch/pull/41377 to update the error message to match the removed arguments
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46397
Reviewed By: malfet
Differential Revision: D24336009
Pulled By: albanD
fbshipit-source-id: b9bf2f9ef7fd2ae622c4079384afc93e9c473f47
