a minor fix to structured_output example for running on window OS (#200)

Author: yzhao244

docs/examples/python/structured_output.py

@@ -41,7 +41,7 @@ class PersonInfo(BaseModel):
         age: int
         occupation: str
 
-    with tempfile.NamedTemporaryFile() as person_file:
+    with tempfile.NamedTemporaryFile(delete=False) as person_file:
         person_file.write(b"John Smith is a 30-year old software engineer")
         person_file.flush()