Windows tutorial env handling, and SQL Server device requirements

Author: kgremban

articles/iot-edge/tutorial-c-module-windows.md

@@ -98,21 +98,22 @@ The deployment manifest shares the credentials for your container registry with
 
 1. In the Visual Studio solution explorer, open the **deployment.template.json** file. 
 
-2. Find the **registryCredentials** property in the $edgeAgent desired properties. 
-
-3. Update the property with your credentials, following this format: 
+2. Find the **registryCredentials** property in the $edgeAgent desired properties. It should have your registry address autofilled from the information you provided when creating the project, and then username and password fields should contain variable names. For example: 
 
    ```json
    "registryCredentials": {
      "<registry name>": {
-       "username": "<username>",
-       "password": "<password>",
+       "username": "$CONTAINER_REGISTRY_USERNAME_<registry name>",
+       "password": "$CONTAINER_REGISTRY_PASSWORD_<registry name>",
        "address": "<registry name>.azurecr.io"
      }
    }
-   ```
 
-4. Save the deployment.template.json file. 
+3. Open the **.env** file in your module solution. (It's hidden by default in the Solution Explorer, so you might need to select the **Show All Files** button to display it.) The .env file should contain the same username and password variables that you saw in the deployment.template.json file. 
+
+4. Add the **Username** and **Password** values from your Azure container registry. 
+
+5. Save your changes to the .env file.
 
 ### Update the module with custom code
 

articles/iot-edge/tutorial-csharp-module-windows.md

@@ -89,21 +89,22 @@ The deployment manifest shares the credentials for your container registry with
 
 1. In the Visual Studio solution explorer, open the **deployment.template.json** file. 
 
-2. Find the **registryCredentials** property in the $edgeAgent desired properties. 
-
-3. Update the property with your credentials, following this format: 
+2. Find the **registryCredentials** property in the $edgeAgent desired properties. It should have your registry address autofilled from the information you provided when creating the project, and then username and password fields should contain variable names. For example: 
 
    ```json
    "registryCredentials": {
      "<registry name>": {
-       "username": "<username>",
-       "password": "<password>",
+       "username": "$CONTAINER_REGISTRY_USERNAME_<registry name>",
+       "password": "$CONTAINER_REGISTRY_PASSWORD_<registry name>",
        "address": "<registry name>.azurecr.io"
      }
    }
-   ```
 
-4. Save the deployment.template.json file. 
+3. Open the **.env** file in your module solution. (It's hidden by default in the Solution Explorer, so you might need to select the **Show All Files** button to display it.) The .env file should contain the same username and password variables that you saw in the deployment.template.json file. 
+
+4. Add the **Username** and **Password** values from your Azure container registry. 
+
+5. Save your changes to the .env file.
 
 ### Update the module with custom code
 

articles/iot-edge/tutorial-develop-for-windows.md

@@ -153,7 +153,7 @@ The IoT Edge runtime needs your registry credentials to pull your container imag
 
 1. Open the **deployment.template.json** file in your module solution.
 
-1. Find the **registryCredentials** property in the $edgeAgent desired properties and ensure it contains the correct information.
+1. Find the **registryCredentials** property in the $edgeAgent desired properties. It should have your registry address autofilled from the information you provided when creating the project, and then username and password fields should contain variable names. For example: 
 
    ```json
    "registryCredentials": {

articles/iot-edge/tutorial-store-data-sql-server.md

@@ -35,7 +35,8 @@ In this tutorial, you learn how to:
 Before beginning this tutorial, you should have gone through the previous tutorial to set up your development environment for Linux container development: [Develop IoT Edge modules for Linux devices](tutorial-develop-for-linux.md). By completing that tutorial, you should have the following prerequisites in place: 
 
 * A free or standard-tier [IoT Hub](../iot-hub/iot-hub-create-through-portal.md) in Azure.
-* A [Linux device running Azure IoT Edge](quickstart-linux.md)
+* An AMD64 [Linux device running Azure IoT Edge](quickstart-linux.md).
+  * ARM devices, like Raspberry Pis, cannot run SQL Server. If you want to use SQL on an ARM device, you can sign up to try [Azure SQL Database Edge](https://azure.microsoft.com/services/sql-database-edge/) in preview. 
 * A container registry, like [Azure Container Registry](https://docs.microsoft.com/azure/container-registry/).
 * [Visual Studio Code](https://code.visualstudio.com/) configured with the [Azure IoT Tools](https://marketplace.visualstudio.com/items?itemName=vsciot-vscode.azure-iot-tools).
 * [Docker CE](https://docs.docker.com/install/) configured to run Linux containers.