Updated cluster-client article
Updated cluster-client article

Fixes incorrect setting and uses file inclusion for reference.conf

ali-ince/akka.net,amichel/akka.net,Silv3rcircl3/akka.net,simonlaroche/akka.net,heynickc/akka.net,simonlaroche/akka.net,ali-ince/akka.net,heynickc/akka.net,amichel/akka.net,Silv3rcircl3/akka.net