Update messages/messenger/send-text.php

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

Author: SecondeJK

messages/messenger/send-text.php

@@ -9,7 +9,7 @@
 
 $client = new \Vonage\Client($keypair);
 
-$sms = new \Vonage\Messages\MessageType\Messenger\MessengerText(
+$message = new \Vonage\Messages\MessageType\Messenger\MessengerText(
  TO_NUMBER,
  FROM_NUMBER,
  'This is a text message sent using the Vonage PHP SDK'