Pub/Sub is written incorrectly in scenario 2 image

[shubjain26]

https://github.com/ashishrv/pyzmqnotes/blob/master/source/pyzmq/patterns/pubsub.rst

Change the scenario2 image, a subscriber socket cannot send data to the publisher socket.

[wlwatkins]

Was about to post the same message. So 2 years later and it has not been changed