fix: MMS content up to spec

Author: SMadani

src/main/java/com/vonage/quickstart/messages/mms/SendMmsContent.java

@@ -35,11 +35,8 @@ public static void main(String[] args) throws Exception {
 		var response = client.getMessagesClient().sendMessage(
 				MmsContentRequest.builder()
 					.from(MMS_SENDER_ID).to(MESSAGES_TO_NUMBER)
-					.addAudio(MESSAGES_AUDIO_URL)
 					.addImage(MESSAGES_IMAGE_URL)
-					.addVideo(MESSAGES_VIDEO_URL)
 					.addFile(MESSAGES_FILE_URL)
-					.addVcard(MESSAGES_VCARD_URL)
 					.build()
 		);
 		System.out.println("Message sent successfully. ID: "+response.getMessageUuid());