add reset password events docs

src/User/Event/ResetPasswordEvent.php

@@ -25,7 +25,7 @@ class ResetPasswordEvent extends Event
     protected $form;
     protected $token;
 
-    public function __construct(Token $token, RecoveryForm $form, array $config = [])
+    public function __construct(Token $token = null, RecoveryForm $form = null, array $config = [])
     {
         $this->form = $form;
         $this->token = $token;