Update reference to RegisterOperators in error message in Convolution (#36389)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/36389
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D20964193
Pulled By: ezyang
fbshipit-source-id: 27aeea01ccf5dfcebb8f043cde009a14dde3958e
