Add 'remote_parameters' and 'get_module_rref' to RemoteModule docs. (#54645)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/54645
Had to replace RRef[..] with just RRef in the return signature since
sphynx seemed to completely mess up rendering RRef[..]
ghstack-source-id: 125024783
Test Plan: View locally.
Reviewed By: SciPioneer
Differential Revision: D27314609
fbshipit-source-id: 2dd9901e79f31578ac7733f79dbeb376f686ed75
