docs: clarify remote query cache keys

[vamshikrishnaramasamy]

Summary

• document that schema-backed remote query cache keys use the original argument shape before validation
• call out extra object properties as cache-key significant for query calls, .set(...), and .refresh()

Closes #16029

Tests

• pnpm exec prettier --check documentation/docs/20-core-concepts/60-remote-functions.md
• git diff --check

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[elliott-with-the-longest-name-on-github]

We're currently discussing whether this is the best direction to go in the maintainers' channel -- we might just change it so that this works the same way on the client and on the server. Will get back to you as soon as we've reached a decision.

[vamshikrishnaramasamy]

Thanks for the heads-up. I’ll hold off on further changes here until maintainers settle on the direction. If you decide to make client/server behavior match instead, I’m happy to adjust or close this PR in favor of that implementation.