Remove outdated comment in hub.py (#63757)
Summary:
This PR removes an outdated comment about Python2 that was orginally introduced in https://github.com/pytorch/pytorch/pull/25083/files. The code has changed since then, but the comment wasn't removed.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/63757
Reviewed By: zou3519
Differential Revision: D30695656
Pulled By: NicolasHug
fbshipit-source-id: 431cf414588b9e5a1ad6acdae724ff5af1b16971