Update overview-iot-plug-and-play-preview-updates.md

Author: elhorton

articles/iot-pnp/overview-iot-plug-and-play-preview-updates.md

@@ -75,7 +75,7 @@ Devices that don't use components require minimal code changes - just announcing
 
 ### Service SDKs
 
-The service SDK is available in [Node.js](https://github.com/Azure/azure-iot-sdk-node/blob/digitaltwins-preview/digitaltwins/service/readme.md) and [Python](https://github.com/Azure/azure-iot-sdk-python/blob/digitaltwins-preview/azure-iot-hub/README.md).
+The service SDK is available in [Node.js](https://github.com/Azure/azure-iot-sdk-node/blob/pnp-preview-refresh/digitaltwins/service/readme.md) and [Python](https://github.com/Azure/azure-iot-sdk-python/blob/digitaltwins-preview/azure-iot-hub/README.md).
 
 ## VS Code extension