Remove orphans

Author: dominicbetts

articles/iot-hub/iot-hub-preview-mode.md

@@ -70,6 +70,5 @@ Do *not* use an IoT hub in preview mode for production. Preview mode is intended
 
 ## Next steps
 
-- To preview the MQTT 5 support, see [IoT Hub MQTT 5 support overview (preview)](/previous-versions/azure/iot/iot-mqtt-5-preview)
 - To preview the ECC server certificate, see [Elliptic Curve Cryptography (ECC) server TLS certificate (preview)](iot-hub-tls-support.md#elliptic-curve-cryptography-ecc-server-tls-certificate)
 - To preview TLS fragment size negotiation, see [TLS maximum fragment length negotiation (preview)](iot-hub-tls-support.md#tls-maximum-fragment-length-negotiation)