GCP: minor change

easycloud/modules/gcp_googleapi/manager.py

@@ -322,6 +322,7 @@ class GCP(MetaManager):
 
                 instances_request = self.gcp_client.instances().list_next(previous_request=instances_request, previous_response=instances_response)
         else:
+            # Get instances from every zones
             instances_request = self.gcp_client.instances().aggregatedList(project=project)
 
             while instances_request is not None: