Swap WinUI topics in TOC

It makes more sense to put chat first because the image topic builds on it.

Author: alvinashcraft

hub/apps/toc.yml

@@ -315,10 +315,10 @@ items:
           items: 
             - name: Windows AI >>
               href: /windows/ai/
-            - name: Add DALL-E image generation to your WinUI 3 desktop app
-              href: how-tos/dall-e-winui3.md
             - name: Add OpenAI chat completions to your WinUI 3 desktop app
               href: how-tos/chatgpt-openai-winui3.md
+            - name: Add DALL-E image generation to your WinUI 3 desktop app
+              href: how-tos/dall-e-winui3.md
             - name: Streamline your WinUI 3 / Windows App SDK development workflow with GitHub Copilot Chat
               href: how-tos/copilot-chat-winui3.md
         - name: DispatcherQueue