message: Clarify how Python and TensorFlow paths are resolved
diff: @@ -105,8 +105,10 @@ C++ Minigo currently supports three separate engines for performing inference:
  - tf: peforms inference using the TensorFlow libraries built by
  `cc/configure_tensorflow.sh`.
  - remote: launches a Python subprocess that performs inference using the
  - version of TensorFlow installed on the system. The remote inference
  - engine is required for running Minigo on Cloud TPU.
  + version of TensorFlow installed on the system. The paths to TensorFlow and
  + the Python binary are resolved normally, so the ones from your virtual
  + environment will be used if you have one. The remote inference engine is
  + required for running Minigo on Cloud TPU.
  - lite: performs inference using TensorFlow Lite, which runs in software on
  the CPU.
  