Upgrade examples to latest version (no legacy models) (#697)

* Update streaming.py

Removed legacy model

* Update streaming.py

* more upgrades

Author: franz101

examples/async_demo.py

@@ -10,7 +10,7 @@
 
 async def main() -> None:
     stream = await client.completions.create(
-        model="text-davinci-003",
+        model="gpt-3.5-turbo-instruct",
         prompt="Say this is a test",
         stream=True,
     )

examples/streaming.py

@@ -13,7 +13,7 @@
 def sync_main() -> None:
     client = OpenAI()
     response = client.completions.create(
-        model="text-davinci-002",
+        model="gpt-3.5-turbo-instruct",
         prompt="1,2,3,",
         max_tokens=5,
         temperature=0,
@@ -33,7 +33,7 @@ def sync_main() -> None:
 async def async_main() -> None:
     client = AsyncOpenAI()
     response = await client.completions.create(
-        model="text-davinci-002",
+        model="gpt-3.5-turbo-instruct",
         prompt="1,2,3,",
         max_tokens=5,
         temperature=0,