uhd: Improve comments near disabled features

, boost

, ncurses

, enableCApi ? true

# requires numpy

# Although we handle the Python API's dependencies in pythonEnvArg, this

# feature is currently disabled as upstream attempts to run `python setup.py

# install` by itself, and it fails because the Python's environment's prefix is

# not a writable directly. Adding support for this feature would require using

# python's pypa/build nad pypa/install hooks directly, and currently it is hard

# to do that because it all happens after a long buildPhase of the C API.

, enablePythonApi ? false

, python3

, buildPackages

, enableExamples ? false

, enableUtils ? false

, libusb1

# Disable dpdk for now due to compilation issues.

, enableDpdk ? false

, dpdk

# Devices