Fix unicode in comments (#24218)
Summary:
Fixes #24164
](https://our.intern.facebook.com/intern/diff/16901789/)
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24218
Pulled By: driazati
Differential Revision: D16901789
fbshipit-source-id: 8f1c7af437e66119bec616bc906c96d5d92cfb13
