Error message update: use proper name of custom c++ classes (#71922)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/71922
Use proper name in the error message and remove "torchbind", since it's not official in documentation.
Test Plan: Imported from OSS
Reviewed By: cccclai
Differential Revision: D33824899
Pulled By: iseeyuan
fbshipit-source-id: 41968494c04fab39292d9cc4dc6e15cca99cbff4
(cherry picked from commit 9732a52ed264f013e9ba3844f86be11d31444954)
