Correct baseURL configuration usage

[recabasic]

This pull request makes a minor update to the example configuration for the ChatOpenAIFields interface in chat_models.ts. The change clarifies how to specify the baseURL using the configuration object instead of a direct property.

• Updated the example for setting baseURL to use the configuration object, improving clarity for users configuring the API client.

@recabasic

Fixes #3565 #3086

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Project	Deployment	Preview	Comments	Updated (UTC)
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[christian-bromann]

LGTM 👍 thanks a lot!