Added escaping of asterisks in file path

Because of how markdown interprets asterisks (*), they were being removed from the file paths in the instructions. Adding a backslash (\) escapes those characters to display properly.

Author: paul-msft

Instructions/Labs/AZ400_M04_L09_Controlling_Deployments_using_Release_Gates.md

@@ -210,13 +210,13 @@ In this task, you will set up the release tasks as part of the Release Pipeline.
 
 1. On the **All pipelines > New Release Pipeline** pane, ensure that the **Canary** stage is selected. In the **Azure subscription** dropdown list, select your Azure subscription and click **Authorize**. If prompted, authenticate by using the user account with the Owner role in the Azure subscription.
 1. Confirm the App Type is set to "Web App on Windows". Next, in the **App Service name** dropdown list, select the name of the **Canary** web app.
-1. Select the Task **Deploy Azure App Service**. In the **Package or Folder** field, update the default value of "$(System.DefaultWorkingDirectory)/**/*.zip" to "$(System.DefaultWorkingDirectory)/**/Web.zip"** 
+1. Select the Task **Deploy Azure App Service**. In the **Package or Folder** field, update the default value of "$(System.DefaultWorkingDirectory)/\*\*/\*.zip" to "$(System.DefaultWorkingDirectory)/\*\*/Web.zip" 
 
     > notice an exclamation mark next to the Tasks tab. This is expected, as we need to configure the settings for the Production Stage.
 
 1. On the **All pipelines > New Release Pipeline** pane, navigate to the **Pipeline** tab, and this time, within the **Production** Stage, click the **1 job, 2 tasks** label. Similar to the Canary stage earlier, complete the pipeline settings. Under the Tasks tab / Production Deployment process, in the **Azure subscription** dropdown list, select the Azure subscription you used for the **Canary Environment** stage, shown under **Available Azure Service connections**, as we already created the service connection before when authorizing the subscription use.
 1. In the **App Service name** dropdown list, select the name of the **Prod** web app.
-1. Select the Task **Deploy Azure App Service**. In the **Package or Folder** field, update the default value of "$(System.DefaultWorkingDirectory)/**/*.zip" to "$(System.DefaultWorkingDirectory)/**/Web.zip"** 
+1. Select the Task **Deploy Azure App Service**. In the **Package or Folder** field, update the default value of "$(System.DefaultWorkingDirectory)/\*\*/\*.zip" to "$(System.DefaultWorkingDirectory)/\*\*/Web.zip" 
 1. On the **All pipelines > New Release Pipeline** pane, click **Save** and, in the **Save** dialog box, click **OK**.
 
 You have now successfully configured the Release Pipeline.