prepare doc preview s3-prefix for future change (#97433)
Sister patch for pytorch/test-infra#3917. TL;DR this moves the doc preview scheme to $OWNER/$REPO rather than $REPO that we are currently rolling.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/97433
Approved by: https://github.com/seemethere, https://github.com/malfet
