qa: add missing type-hints to workflow `Transition`

Signed-off-by: Maximilian Bösing <2189546+boesing@users.noreply.github.com>

src/Symfony/Component/Workflow/Transition.php

@@ -32,16 +32,25 @@ class Transition
         $this->tos = (array) $tos;
     }
 
+    /**
+     * @return string
+     */
     public function getName()
     {
         return $this->name;
     }
 
+    /**
+     * @return string[]
+     */
     public function getFroms()
     {
         return $this->froms;
     }
 
+    /**
+     * @return string[]
+     */
     public function getTos()
     {
         return $this->tos;