message: update help message after clang format
diff: @@ -105,7 +105,7 @@ pipeline {
  git commit -m "[Jenkins] auto-formatting by `clang-format --version`"
  git push https://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/${fork()}/cmdstan.git ${branchName()}
  echo "Exiting build because clang-format found changes."
  - echo "Those changes are now found on stan-dev/stan under branch ${branchName()}"
  + echo "Those changes are now found on stan-dev/cmdstan under branch ${branchName()}"
  echo "Please 'git pull' before continuing to develop."
  exit 1
  fi
  