Clang format ProcessGroupNCCL.cpp (#56840)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56840
Per comments in https://github.com/pytorch/pytorch/pull/56427/files
ghstack-source-id: 128142665
Test Plan: Ci
Reviewed By: SciPioneer
Differential Revision: D27980768
fbshipit-source-id: 0158ae1cfd892ff3385ffa0084dd7ef9de014f8c
