Small updates to RELEASE.md (#65489)
Summary:
Combine `xla` and `builder` branch pinning steps and link them to a PR that does it correctly
Update example PR for version bump, as few files have changed
Deleted FaceHub step as it is no longer necessary after recent update
Pull Request resolved: https://github.com/pytorch/pytorch/pull/65489
Reviewed By: zhouzhuojie, seemethere
Differential Revision: D31120498
Pulled By: malfet
fbshipit-source-id: e1a9db2b03243c8d28eeed9888c3653e4460ad07
