C179749: Adding missing backticks at end of code

Localization team has reported source content issue that causes localized version to have broken/different format compared to en-us version.
Description of the source issue: Lack of a backticks at the end of code-block is preventing following content to be localized

Author: v-maudel

articles/azure-functions/functions-create-function-linux-custom-image.md

@@ -334,6 +334,7 @@ A function app on Azure manages the execution of your functions in your hosting
 
     ```azurecli
     az storage account show-connection-string --resource-group AzureFunctionsContainers-rg --name <storage_name> --query connectionString --output tsv
+    ```
     
 1. Add this setting to the function app by using the [az functionapp config appsettings set](/cli/azure/functionapp/config/appsettings#az-functionapp-config-appsettings-set) command. In the following command, replace `<app_name>` with the name of your function app, and replace `<connection_string>` with the connection string from the previous step (a long encoded string that begins with "DefaultEndpointProtocol="):