Move rpc.rst back to the source folder to preserve existing doc URLs (#36675)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/36675
Test Plan: Imported from OSS
Differential Revision: D21048628
Pulled By: mrshenli
fbshipit-source-id: 3cb1b35ddc1f40c673b0db9048d77dfa024be1e7
