Fix CLI parameters

Author: PatAltimore

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

@@ -74,11 +74,11 @@ When you create the new device identity, provide the following information:
 You also can use the [IoT extension for Azure CLI](https://github.com/Azure/azure-iot-cli-extension) to complete the same operation. The following example uses the [az iot hub device-identity](/cli/azure/iot/hub/device-identity) command to create a new IoT device with symmetric key authentication and assign a parent device:
 
 ```azurecli
-az iot hub device-identity create -n {iothub name} -d {new device ID} --device-scope {deviceScope of parent device}.
+az iot hub device-identity create -n {iothub name} -d {new device ID} --device-scope {deviceScope of parent device}
 ```
 
 > [!TIP]
-> You can list device properties including device scope using `az iot hub device-identity list --hub-name {iothub name}`
+> You can list device properties including device scope using `az iot hub device-identity list --hub-name {iothub name}`.
 
 Next, [Retrieve and modify the connection string](#retrieve-and-modify-connection-string) so that your device knows to connect via its gateway.
 
@@ -132,9 +132,12 @@ For X.509 self-signed authentication, sometimes referred to as thumbprint authen
 You also can use the [IoT extension for Azure CLI](https://github.com/Azure/azure-iot-cli-extension) to complete the same device creation operation. The following example uses the [az iot hub device-identity](/cli/azure/iot/hub/device-identity) command to create a new IoT device with X.509 self-signed authentication and assigns a parent device:
 
 ```azurecli
-az iot hub device-identity create -n {iothub name} -d {device ID} --pd {gateway device ID} --am x509_thumbprint --ptp {primary thumbprint} --stp {secondary thumbprint}
+az iot hub device-identity create -n {iothub name} -d {device ID} --device-scope {deviceScope of gateway device} --am x509_thumbprint --ptp {primary thumbprint} --stp {secondary thumbprint}
 ```
 
+> [!TIP]
+> You can list device properties including device scope using `az iot hub device-identity list --hub-name {iothub name}`.
+
 Next, [Retrieve and modify the connection string](#retrieve-and-modify-connection-string) so that your device knows to connect via its gateway.
 
 ### X.509 CA-signed authentication
@@ -176,9 +179,12 @@ This section is based on the IoT Hub X.509 certificate tutorial series. See [Und
 You also can use the [IoT extension for Azure CLI](https://github.com/Azure/azure-iot-cli-extension) to complete the same device creation operation. The following example uses the [az iot hub device-identity](/cli/azure/iot/hub/device-identity) command to create a new IoT device with X.509 CA signed authentication and assigns a parent device:
 
 ```azurecli
-az iot hub device-identity create -n {iothub name} -d {device ID} --pd {gateway device ID} --am x509_ca
+az iot hub device-identity create -n {iothub name} -d {device ID} --device-scope {deviceScope of gateway device} --am x509_ca
 ```
 
+> [!TIP]
+> You can list device properties including device scope using `az iot hub device-identity list --hub-name {iothub name}`.
+
 Next, [Retrieve and modify the connection string](#retrieve-and-modify-connection-string) so that your device knows to connect via its gateway.
 
 ## Retrieve and modify connection string