Use double quotes in C++ to stay consistent with Python RPC docs (#34095)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/34095
Test Plan: Imported from OSS
Differential Revision: D20227343
Pulled By: mrshenli
fbshipit-source-id: 69c556beee1f9e944eb1053b5ff0ac368dd99c60
