[Wiki] update release notes wrt. exponential backoff in mqtt conncection
[Wiki] update release notes wrt. exponential backoff in mqtt conncection

Change-Id: I17ae2011d043c934855795b5b5623d8b39473d89

bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr,bmwcarit/joynr