[Notifier] Add missing imports

Author: jschaedl

notifier.rst

@@ -389,8 +389,8 @@ Symfony provides two types of recipients:
 
 .. versionadded:: 5.2
 
-    The `AdminRecipient` class was removed in Symfony 5.2, you should use
-    `Recipient` instead.
+    The ``AdminRecipient`` class was removed in Symfony 5.2, you should use
+    ``Recipient`` instead.
 
 Configuring Channel Policies
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -506,7 +506,8 @@ very high and the recipient has a phone number::
     namespace App\Notifier;
 
     use Symfony\Component\Notifier\Notification\Notification;
-    use Symfony\Component\Notifier\Recipient\Recipient;
+    use Symfony\Component\Notifier\Recipient\RecipientInterface;
+    use Symfony\Component\Notifier\Recipient\SmsRecipientInterface;
 
     class InvoiceNotification extends Notification
     {
@@ -545,7 +546,7 @@ and its ``asChatMessage()`` method::
     use Symfony\Component\Notifier\Message\ChatMessage;
     use Symfony\Component\Notifier\Notification\ChatNotificationInterface;
     use Symfony\Component\Notifier\Notification\Notification;
-    use Symfony\Component\Notifier\Recipient\Recipient;
+    use Symfony\Component\Notifier\Recipient\SmsRecipientInterface;
 
     class InvoiceNotification extends Notification implements ChatNotificationInterface
     {