Docs: Add section about how cache-control headers are set, depending on how your pages fetch data

[molebox]

What is the improvement or update you wish to see?

See this comment: #33204 (comment)

Is there any context that might help us understand?

^

Does the docs page already exist? Please link to it.

Maybe here: https://nextjs.org/docs/going-to-production#caching and here: https://nextjs.org/docs/api-reference/next.config.js/headers#cache-control

[Gomurmamma]

Hey, I'd like to contribute in regards to this issue! Can I be assigned?

[github-actions]

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