Merge pull request #257 from MicrosoftLearning/patch-lab08

lab08: remove "az extension"

Author: unaihuete93

Instructions/Labs/AZ400_M04_Controlling_Deployments_using_Release_Gates.md

@@ -116,13 +116,6 @@ In this task, you will create two Azure web apps representing the **Canary** and
     az appservice plan create -g $RESOURCEGROUPNAME -n $SERVICEPLANNAME --sku S1
     ```
 
-    > **Note**: If the `az appservice plan create` command fails with an error message starting with `ModuleNotFoundError: No module named 'vsts_cd_manager'`, then run the following commands and then re-run the failed command.
-
-    ```bash
-    az extension remove -n appservice-kube
-    az extension add --yes --source "https://aka.ms/appsvc/appservice_kube-latest-py2.py3-none-any.whl"
-    ```
-
 1.  Create two web apps with unique app names.
 
      ```bash