Update messages/whatsapp/send-image.php

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

Author: SecondeJK

messages/whatsapp/send-image.php

@@ -14,7 +14,7 @@
  'This is a whatsapp image'
 );
 
-$sms = new \Vonage\Messages\MessageType\Messenger\MessengerImage(
+$whatsApp = new \Vonage\Messages\MessageType\Messenger\MessengerImage(
  TO_NUMBER,
  FROM_NUMBER,
  $imageObject