docs(pubsub): document add-connection method
docs(pubsub): document add-connection method

JGrothoff/open62541,open62541/open62541,JGrothoff/open62541,jpfr/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,JGrothoff/open62541,jpfr/open62541,open62541/open62541,open62541/open62541