Remove object-based collective APIs from public docs (#46075)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/46075
Removes these from public docs for now as we are still
iterating/formalizing these APIs. Will add them back once they are part of a
PyTorch release.
ghstack-source-id: 113928700
Test Plan: CI
Reviewed By: mrshenli
Differential Revision: D24211510
fbshipit-source-id: 3e36ff6990cf8e6ef72b6e524322ae06f9097aa2
