FIX: explicitly state read and write concern in causal consistency examples (#374)
FIX: explicitly state read and write concern in causal consistency examples (#374)

PYTHON-1623 Causal Consistency Examples for the Manual
ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver