Update using-images.md

src/tips-tricks/using-images.md

@@ -3,7 +3,7 @@
 To upload images you can do one of two things:
 1. Upload it to the github repository manually, outside of the GPT Engineer UI
 2. Share an external image URL in the chat.
-    **Note**: This will not work if the server hosting the URL has chosen to block external websites from using it with "CORS"
+    a. **Note**: This will not work if the server hosting the URL has chosen to block external websites from using it with "CORS"
 
 
 Below, we’ll walk you through the two methods.