📝 Remove *, from functions where it's not needed #1234 (#1239)

* Fix for - [FEATURE] Remove *, where it's not needed #1234

* 🔥 Remove unnecessary arg *,

* 🎨 Update docs format highlight lines

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

docs_src/schema_extra_example/tutorial003.py

@@ -13,7 +13,6 @@ class Item(BaseModel):
 
 @app.put("/items/{item_id}")
 async def update_item(
-    *,
     item_id: int,
     item: Item = Body(
         ...,
@@ -23,7 +22,7 @@ async def update_item(
             "price": 35.4,
             "tax": 3.2,
         },
-    )
+    ),
 ):
     results = {"item_id": item_id, "item": item}
     return results