[Notifier] Fix two minor issues

Author: fancyweb

Message/SmsMessage.php

@@ -37,7 +37,7 @@ public function __construct(string $phone, string $subject)
     public static function fromNotification(Notification $notification, Recipient $recipient, string $transport = null): self
     {
         if (!$recipient instanceof SmsRecipientInterface) {
-            throw new LogicException(sprintf('To send a SMS message, "%s" should implement "%s" or the recipient should implement "%s".', get_class($notification), SmsNotificationInterface::class, SmsRecipientInterface::class));
+            throw new LogicException(sprintf('To send a SMS message, "%s" should implement "%s" or the recipient should implement "%s".', \get_class($notification), SmsNotificationInterface::class, SmsRecipientInterface::class));
         }
 
         return new self($recipient->getPhone(), $notification->getSubject());