Rename hubconf.conf to hubconf.py in docs (#21631)
Summary:
It's a typo I guess. cc fmassa
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21631
Differential Revision: D15764909
Pulled By: soumith
fbshipit-source-id: 5ffc7bde181c13e151332e7de3c0da36505b495e
