Update messages/messenger/send-file.php

Co-authored-by: Karl Lingiah <karl@superchilled.co.uk>

Author: SecondeJK

messages/messenger/send-file.php

@@ -13,7 +13,7 @@
  'https://example.com/file.pdf',
 );
 
-$sms = new \Vonage\Messages\MessageType\Messenger\MessengerFile(
+$message = new \Vonage\Messages\MessageType\Messenger\MessengerFile(
  TO_NUMBER,
  FROM_NUMBER,
  $fileObject