Update samples links to feature/digitaltwin branch instead of master …

…to avoid directing to 404

iothub/device/samples/readme.md

@@ -60,7 +60,7 @@ You need to clone the repository or download the sample (the one you want to try
 [d-file-upload-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/FileUploadSample
 [d-keys-rollover-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/KeysRolloverSample
 [d-import-export-devices-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/ImportExportDevicesSample
-[d-pnp-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/PnpDeviceSamples
+[d-pnp-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/feature/digitaltwin/iot-hub/Samples/device/PnpDeviceSamples
 [d-xamarin-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/device/XamarinSample
 
 [module-samples]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/module

iothub/service/samples/readme.md

@@ -23,5 +23,5 @@ Service samples were moved to [Azure-Samples/azure-iot-samples-csharp][samples-r
 [jobs-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/service/JobsSample
 [reg-man-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/service/RegistryManagerSample
 [service-client-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/service/ServiceClientSample
-[pnp-service-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/service/PnpServiceSamples
+[pnp-service-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/feature/digitaltwin/iot-hub/Samples/service/PnpServiceSamples
 [digital-twin-client-sample]: https://github.com/Azure-Samples/azure-iot-samples-csharp/tree/master/iot-hub/Samples/service/DigitalTwinClientSamples