Issue #2897130 followup by timmillwood, Wim Leers: Fix @internal documentation.

core/modules/workflows/src/StateInterface.php

@@ -4,6 +4,10 @@
 
 /**
  * An interface for state value objects.
+ *
+ * @internal
+ *   The StateInterface should only be used by Workflows and Content Moderation.
+ * @todo Revisit the need for this in https://www.drupal.org/node/2902309.
  */
 interface StateInterface {
 

core/modules/workflows/src/TransitionInterface.php

@@ -4,6 +4,12 @@
 
 /**
  * A transition value object that describes the transition between two states.
+ *
+ * @internal
+ *   The TransitionInterface should only be used by Workflows and Content
+ *   Moderation.
+ *
+ * @todo Revisit the need for this in https://www.drupal.org/node/2902309.
  */
 interface TransitionInterface {