Update planned-maintenance.md

Author: craigshoemaker

articles/container-apps/planned-maintenance.md

@@ -84,10 +84,10 @@ Times in UTC format are expressed using the 24-hour time format. For instance, i
 
 ## View the window configuration
 
-You can view an environment's maintenance window with the `maintenance-config show` command.
+You can view an environment's maintenance window with the `maintenance-config list` command.
 
 ```azurecli
-az containerapp env maintenance-config show \
+az containerapp env maintenance-config list \
   --resource-group <RESOURCE_GROUP> \
   --environment <ENVIRONMENT_NAME>
 ```
@@ -123,4 +123,4 @@ Planned maintenance is free during preview.
 ## Next steps
 
 > [!div class="nextstepaction"]
-> [Observability overview](./observability.md)
+> [Observability overview](./observability.md)