message: note that enable_tf is not required for GTP mode
diff: @@ -19,6 +19,7 @@ config_setting(
  # functionality, which is provided by TensorFlow:
  # - Google Cloud Storage access.
  # - Writing TensorFlow examples at the end of self play.
  +# enable_tf is not required to play Minigo over GTP.
  config_setting(
  name = "enable_remote",
  define_values = {"remote": "1"},
  