Workflow: add 2nd arg to property setter example

Author: simon-schubert

workflow.rst

@@ -175,7 +175,7 @@ The configured property will be used via it's implemented getter/setter methods
             return $this->currentPlace;
         }
 
-        public function setCurrentPlace($currentPlace)
+        public function setCurrentPlace($currentPlace, $context = [])
         {
             $this->currentPlace = $currentPlace;
         }