Doxygen for torchbind (#35007)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/35007
Test Plan: Imported from OSS
Reviewed By: driazati
Differential Revision: D20525680
Pulled By: jamesr66a
fbshipit-source-id: aaa768f395e30dcec8007d50e17f21837c306719
