[电大老baby (HhH666-ux)]

Problem

The OpenAIChatCompletionClient reference shows Ollama as the non-OpenAI example and nothing for other prepaid or hosted OpenAI-compatible endpoints. Readers have to infer the host, key format, and the fact that model_info is required because the model id is not an OpenAI name.

Implementation

Add a short PZERO example directly after the Ollama snippet in the client docstring, using the existing base_url + model_info seam. No provider-specific API or dependency is added.

Verification

• python -m py_compile python/packages/autogen-ext/src/autogen_ext/models/openai/_openai_client.py (docstring change compiles).
• The snippet mirrors the documented OpenAIChatCompletionClient arguments and uses ModelFamily.UNKNOWN for a non-OpenAI family.

Limitations

Documentation only; the example is not exercised by a live endpoint in CI.

Fixes #8101

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