Chore: fix typo in grpc test-cluster.sh (#1280)

5051 is node-1 and 5052 is node-2

examples/raft-kv-memstore-grpc/test-cluster.sh

@@ -125,15 +125,15 @@ echo
 rpc 5051 Metrics '{}'
 sleep 1
 
-echo "Write foo=zoo on node-3"
+echo "Write foo=zoo on node-1"
 sleep 1
 echo
 rpc 5051 Set '{"key":"foo","value":"zoo"}' true
 sleep 1
 echo "Data written"
 sleep 1
 
-echo "Read foo=zoo from node-3"
+echo "Read foo=zoo from node-2"
 sleep 1
 echo "Read from node 2"
 echo