Add phpdoc about exception

Author: VincentLanglet

WorkflowInterface.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Workflow;
 
 use Symfony\Component\Workflow\Exception\LogicException;
+use Symfony\Component\Workflow\Exception\UndefinedTransitionException;
 use Symfony\Component\Workflow\MarkingStore\MarkingStoreInterface;
 use Symfony\Component\Workflow\Metadata\MetadataStoreInterface;
 
@@ -38,6 +39,8 @@ public function can(object $subject, string $transitionName): bool;
 
     /**
      * Builds a TransitionBlockerList to know why a transition is blocked.
+     *
+     * @throws UndefinedTransitionException If the transition is not defined
      */
     public function buildTransitionBlockerList(object $subject, string $transitionName): TransitionBlockerList;