TxEventQ Transactional Producer Typo

Signed-off-by: Anders Swanson <anders.swanson@oracle.com>

Author: anders-swanson

docs-source/transactional-event-queues/content/kafka/transactional-messaging.md

@@ -61,7 +61,6 @@ public void produce(String record) {
         // 2. Create the producer record and prepare to send it to a topic
         ProducerRecord<String, String> pr = new ProducerRecord<>(
                 topic,
-                Integer.toString(idx),
                 record
         );
         producer.send(pr);