minor symfony#20783 [Workflow] Added missing docblock (Padam87)

This PR was merged into the 3.2 branch.

Discussion
----------

[Workflow] Added missing docblock

| Q             | A
| ------------- | ---
| Branch?       |  3.2
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

8fe144e [Workflow] Added missing docblock

Author: fabpot

src/Symfony/Component/Workflow/DefinitionBuilder.php

@@ -79,6 +79,9 @@ public function addPlaces(array $places)
         }
     }
 
+    /**
+     * @param Transition[] $transitions
+     */
     public function addTransitions(array $transitions)
     {
         foreach ($transitions as $transition) {

src/Symfony/Component/Workflow/Registry.php

@@ -30,6 +30,12 @@ public function add(Workflow $workflow, $className)
         $this->workflows[] = array($workflow, $className);
     }
 
+    /**
+     * @param object      $subject
+     * @param string|null $workflowName
+     *
+     * @return Workflow
+     */
     public function get($subject, $workflowName = null)
     {
         $matched = null;