fix code block

Author: linglingye001

articles/azure-app-configuration/quickstart-chat-completion-go.md

@@ -463,3 +463,4 @@ The full sample source code is available in the [Azure App Configuration GitHub
     You: What is your name?
     AI: Arrr, matey! Me name be Eddy, the most fearsome pirate to ever sail the seven seas!
     What be yer name, landlubber? 
+    ```