Remove old references to 9.2 in documentation (#65059)
Summary:
Removes references in .rst and README.md and comments in the Dockerfile
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65059
Reviewed By: malfet
Differential Revision: D30961110
Pulled By: janeyx99
fbshipit-source-id: 702a9a81bf08125ec4ac38bc656fc2c128c30018
