Fix Team Tagging in CODEOWNERS
Summary:
The pytorch-dev-infra team taggin syntax in codeowners currently
doesn't work (see: https://github.com/pytorch/pytorch/pull/75221). Trying to
fix that in this PR.
Test Plan: TBD
Differential Revision: D35372228
Pull Request resolved: https://github.com/pytorch/pytorch/pull/75222
Approved by: https://github.com/seemethere
