DLX guide: amend the headers name introduced in rabbitmq/rabbitmq-server#1332
DLX guide: amend the headers name introduced in rabbitmq/rabbitmq-server#1332

rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website,rabbitmq/rabbitmq-website