fix(ai): update matching OpenAI specs

ai-data/generative-apis/api-cli/using-chat-api.mdx

@@ -67,6 +67,7 @@ Our chat API is OpenAI compatible. Use OpenAI’s [API reference](https://platfo
 - top_p
 - max_tokens
 - stream
+- stream_options
 - presence_penalty
 - [response_format](/ai-data/generative-apis/how-to/use-structured-outputs)
 - logprobs

ai-data/generative-apis/how-to/query-language-models.mdx

@@ -139,7 +139,7 @@ response = client.chat.completions.create(
 )
 
 for chunk in response:
-    if chunk.choices[0].delta.content:
+    if chunk.choices and chunk.choices[0].delta.content:
         print(chunk.choices[0].delta.content, end="")
 ```
 
@@ -167,7 +167,8 @@ async def main():
         stream=True,
     )
     async for chunk in stream:
-        print(chunk.choices[0].delta.content, end="")
+        if chunk.choices and chunk.choices[0].delta.content:
+            print(chunk.choices[0].delta.content, end="")
 
 asyncio.run(main())
 ```

ai-data/generative-apis/how-to/query-vision-models.mdx

@@ -201,7 +201,7 @@ response = client.chat.completions.create(
 )
 
 for chunk in response:
-    if chunk.choices[0].delta.content:
+    if chunk.choices and chunk.choices[0].delta.content:
         print(chunk.choices[0].delta.content, end="")
 ```
 
@@ -232,7 +232,8 @@ async def main():
         stream=True,
     )
     async for chunk in stream:
-        print(chunk.choices[0].delta.content, end="")
+        if chunk.choices and chunk.choices[0].delta.content:
+            print(chunk.choices[0].delta.content, end="")
 
 asyncio.run(main())
 ```