cubicweb #2897177 Inter-instance communication doc is wrong [validation pending]

it use subscribe instead of add_subscription and zmqpickle-tcp:// instead of tcp://

prioritynormal
typebug
done in3.16.5
load0.250
load left0.000
closed by#26fddf8d65d0 Fix documentation for zmq pub/sub hooks and configuration
patchFix documentation for zmq pub/sub hooks and configuration [applied]