docs(examples): fix two stale example comments (openai#3877)

## Summary

- `examples/parsing_tools_stream.py:27`: the comment credits
`.parse_stream()` for the tool-call deserialization, but no such method
exists in the SDK (`grep -rn parse_stream src/openai` → 0) — the
wrapping comes from `pydantic_function_tool(...)`. The comment drifted
when the example moved from `client.beta.chat.completions.stream`.
- `examples/realtime/audio_util.py:16`: `CHUNK_LENGTH_S = 0.05 # 100ms`
— 0.05 s is 50 ms (1200 frames at the module's 24 kHz rate). Comment
corrected.

Comment-only changes in examples/.

## Checklist

- [x] I understand that this repository is auto-generated and my pull
request may not be merged

Co-authored-by: Marcus Wood <marcuswood@openai.com>

Author: simpleqt

examples/parsing_tools_stream.py

@@ -24,7 +24,7 @@ class GetWeather(BaseModel):
         },
     ],
     tools=[
-        # because we're using `.parse_stream()`, the returned tool calls
+        # because the tool is built with `pydantic_function_tool(...)`, the returned tool calls
         # will be automatically deserialized into this `GetWeather` type
         openai.pydantic_function_tool(GetWeather, name="get_weather"),
     ],

examples/realtime/audio_util.py

@@ -13,7 +13,7 @@
 
 from openai.resources.realtime.realtime import AsyncRealtimeConnection
 
-CHUNK_LENGTH_S = 0.05  # 100ms
+CHUNK_LENGTH_S = 0.05  # 50ms
 SAMPLE_RATE = 24000
 FORMAT = pyaudio.paInt16
 CHANNELS = 1