Apply suggestions from code review

Co-authored-by: Benedikt Rollik <[email protected]>

Author: RoRoJ

pages/iot-hub/concepts.mdx

@@ -66,7 +66,9 @@ Message filters restrict the messages a device can publish or subscribe to. Each
 
 Message Queuing Telemetry Transport (MQTT) is a lightweight publish/subscribe protocol for exchanging messages between devices and/or applications. Find out more about MQTT [on our blog](https://www.scaleway.com/en/blog/introduction-to-mqtt-protocol/).
 
-Scaleway IoT Hub supports MQTT v3.1, but not MQTT v5.
+<Message type="note">
+  Scaleway IoT Hub supports MQTT v3.1, but not MQTT v5.
+</Message>
 
 ## Mutual TLS (mTLS)