Update the mysql-connector-python docs for now

Update the mysql-connector-python docs for now

mysql-connector-python still seems to have issues with binary datatypes
but the other issues here, with the possible exception of the deadlock
still being investigated, seem to have been resolved in the recent
8.x series of mysql-connector-python.   The driver is still not
recommended due to these issues however we don't need a special
class of warnings at this point.

Change-Id: I2d59e76df5e84b34e318a24b468626900c39da46
References: #4531
(cherry picked from commit 312d529dbbaa9bb7d8d804280cb39797c6402931)