add todo for default storage class

p0f/operators/roles/deploy-odf-storage/tasks/main.yml

@@ -10,6 +10,9 @@
 #   odf_storage:
 #     namespace:          which namespace ODF operator is in
 #     name:               the name of the storage cluster
+#     default_sc:         TODO: the name of the storage class to set as default
+#                         for the cluster (optional)
+#                         storageclass.kubernetes.io/is-default-class=true
 #
 # Optional variables:
 #