(Azure CXP) fixes a typo

resolves MicrosoftDocs/azure-docs#103953

Author: mikeurnun

articles/container-apps/azure-arc-create-container-app.md

@@ -34,7 +34,7 @@ Next, add the required Azure CLI extensions.
 
 ```azurecli-interactive
 az extension add --upgrade --yes --name customlocation
-az extension remove --name containerapps
+az extension remove --name containerapp
 az extension add -s https://download.microsoft.com/download/5/c/2/5c2ec3fc-bd2a-4615-a574-a1b7c8e22f40/containerapp-0.0.1-py2.py3-none-any.whl --yes
 ```