rm trailing spaces

Author: katia-openai

README.md

@@ -158,7 +158,7 @@ pip install -r shopping_cart_python/requirements.txt
 uvicorn shopping_cart_python.main:app --port 8000
 ```
 
-> [!NOTE]  
+> [!NOTE]
 > In production you should persist the cart server-side (see [shopping_cart_python/README.md](shopping_cart_python/README.md)), but this demo shows the mechanics of keeping state through `widgetSessionId`.
 
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