Adjust maintainers list (#23693)
Summary:
Adds new people and reorders sections to make more sense
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23693
Differential Revision: D16618230
Pulled By: dzhulgakov
fbshipit-source-id: 74191b50c6603309a9e6d14960b7c666eec6abdd
