PYTHON-1052 - Clarify delegated auth example
PYTHON-1052 - Clarify delegated auth example

aherlihy/mongo-python-driver,ShaneHarvey/mongo-python-driver,ramnes/mongo-python-driver,mongodb/mongo-python-driver,ShaneHarvey/mongo-python-driver,ShaneHarvey/mongo-python-driver,ramnes/mongo-python-driver,ramnes/mongo-python-driver,aherlihy/mongo-python-driver,mongodb/mongo-python-driver,mongodb/mongo-python-driver,aherlihy/mongo-python-driver