Update understand-device-update.md

Author: eshashah-msft

articles/iot-hub-device-update/understand-device-update.md

@@ -25,7 +25,7 @@ To realize the full benefits of IoT-enabled digital transformation, customers ne
 Device Update for IoT Hub offers optimized update deployment and streamlined operations through integration with [Azure IoT Hub](https://azure.microsoft.com/services/iot-hub/). This integration makes it easy to adopt Device Update on any existing solution. It provides a cloud-hosted solution to connect virtually any device. Device Update supports a broad range of IoT operating systems—including Linux and [Eclipse ThreadX](https://github.com/eclipse-threadx) (real-time operating system)—and is extensible via open source. We're codeveloping Device Update for IoT Hub offerings with our semiconductor partners, including STMicroelectronics, NXP, Renesas, and Microchip. See the [samples](https://github.com/eclipse-threadx/samples/tree/PublicPreview/ADU) of key semiconductors evaluation boards that include the get started guides to learn how to configure, build, and deploy the over-the-air updates to MCU class devices.
 
 Both a Device Update agent simulator binary and Raspberry Pi reference Yocto images are provided.
-Device Update agents are built and provided for Ubuntu Server 18.04, Ubuntu Server 20.04, and Debian 10. Device Update for IoT Hub also provides open-source code if you aren't
+Device Update agents are built and provided for [various Linux OSs](support.md). Device Update for IoT Hub also provides open-source code if you aren't
 running one of the above platforms. You can port the agent to the distribution you're running.
 
 Device Update for IoT Hub also supports updating Azure IoT Edge devices.
@@ -121,4 +121,4 @@ For more information about Device Update groups, see [Device groups](device-upda
 
 Get started with Device Update by trying a sample:
 
-[Tutorial: Device Update using the simulator agent](device-update-simulator.md)
+[Tutorial: Device Update using the simulator agent](device-update-simulator.md)