fix lint errors in tutorial002.py

docs_src/handling_errors/tutorial002.py

@@ -7,7 +7,7 @@ items = {"foo": "The Foo Wrestlers"}
 
 @app.get("/items-header/{item_id}")
 async def read_item_header(item_id: str):
-    
+
     if item_id not in items:
         raise HTTPException(
             status_code=404,