Update BlackrockRawIO arg docs
Update BlackrockRawIO arg docs

Co-Authored-By: samuelgarcia <a672182f90119ff9a029c322198576fe8d9a90c8@gmail.com>
JuliaSprenger/python-neo,rgerkin/python-neo,NeuralEnsemble/python-neo,INM-6/python-neo,samuelgarcia/python-neo,apdavison/python-neo