[WIP] Review Ch8

[Copilot]

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original issue description:

Check https://github.com/microsoft/generative-ai-with-javascript/pull/108/files#diff-917fdf5a1e46ff2c23f17d308fa29524d2152024238d1e95b906bab15d67910c for the following:

• spelling and grammar
• usage of colons and consistent naming etc
• structure compared to lessons/https://github.com/microsoft/generative-ai-with-javascript/tree/main/lessons/01-intro-to-genai/README.md that should be treated as a good example of structure

Fixes #125.

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