Update the Gemini Image Chat readme

[lethargicpanda]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @lethargicpanda, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the accuracy and detail of the documentation for two Gemini AI samples. It updates the referenced generative models in their respective README files and provides a more comprehensive example of model instantiation for the Gemini Image Chat sample, ensuring users have up-to-date and clear guidance.

Highlights

• Model Reference Update: The gemini-chatbot sample's README has been updated to reflect the use of the gemini-2.5-flash model, replacing the previous gemini-3-pro-image-preview reference.
• Documentation for Gemini 3 Pro Image: The gemini-image-chat sample's README now accurately describes the use of Gemini 3 Pro Image (Nano Banana Pro) and includes a detailed code snippet for its instantiation, showcasing generationConfig, safetySettings, and systemInstruction.

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[gemini-code-assist]

Code Review

This pull request updates the README files for the gemini-chatbot and gemini-image-chat samples to align the documented Gemini model names with what is used in the source code. The changes improve the accuracy and consistency of the documentation. I have one suggestion for the gemini-image-chat README to address a minor inconsistency.