Remind about AutoNonVariableTypeMode in error message. (#51655)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/51655
Test Plan: Imported from OSS
Reviewed By: bhosmer
Differential Revision: D26228508
Pulled By: ailzhang
fbshipit-source-id: f5f48fde3611c84cc6473b77824ebf9dffbb4453
