message: Fix typo in TF bazelrc.
  With this change, TF builds can be run using RBE just by using some config options.
diff: @@ -368,7 +368,7 @@ build:rbe_win_py37 --python_path=C:\\Python37\\python.exe
  # These you may need to change for your own GCP project.
  build:tensorflow_testing_rbe --project_id=tensorflow-testing
  -common:tensorflow_testing_rbe_linux --remote_instance_name=tensorflow-testing/instances/default_instance
  +common:tensorflow_testing_rbe_linux --remote_instance_name=projects/tensorflow-testing/instances/default_instance
  build:tensorflow_testing_rbe_linux --config=tensorflow_testing_rbe
  build:tensorflow_testing_rbe_linux --config=rbe
  build:tensorflow_testing_rbe_linux --config=rbe_linux
  