Merge pull request #113245 from kgremban/apr29-pythondownstreamsample2

update python downstream sample

Author: PRMerger6

articles/iot-edge/how-to-connect-downstream-device.md

@@ -178,9 +178,9 @@ This section introduces a sample application to connect an Azure IoT Java device
 
 This section introduces a sample application to connect an Azure IoT Python device client to an IoT Edge gateway.
 
-1. Get the sample for **send_message** from the [Azure IoT device SDK for Python samples](https://github.com/Azure/azure-iot-sdk-python/tree/master/azure-iot-device/samples/async-edge-scenarios).
-2. Ensure that you are either running in an IoT Edge container, or in a debug scenario, have the `EdgeHubConnectionString` and `EdgeModuleCACertificateFile` environment variables set.
-3. Refer to the SDK documentation for instructions on how to run the sample on your device.
+1. Get the sample for **send_message_downstream** from the [Azure IoT device SDK for Python samples](https://github.com/Azure/azure-iot-sdk-python/tree/master/azure-iot-device/samples/async-edge-scenarios).
+2. Set the `IOTHUB_DEVICE_CONNECTION_STRING` and `IOTEDGE_ROOT_CA_CERT_PATH` environment variables as specified in the Python script comments.
+3. Refer to the SDK documentation for any additional instructions on how to run the sample on your device.
 
 ## Test the gateway connection