fix(live-content-collections): update cacheHint code snippet

[ArmandPhilippot]

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Fixes how we define cacheHint in a code snippet of experimental-flags/live-content-collections. I reused the version we have for the v6 docs, so this also adds imports.

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• Suggested label: code snippet update

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[delucis]

Thanks @ArmandPhilippot! I think I’m probably missing some context on this one, so feel free to disregard my feedback if it’s not helpful.

[sarah11918]

LGTM, thanks Armand!

It looks like re: carrying this over to #12604 it's just the addition of getLastModified that needs updating there, too?

(That PR is to v6, and is not yet updated to main... so I think the easiest thing to do is update 12604 to match right now. 😄 )

[ArmandPhilippot]

There are three lines to update in the v6 PR: the imports and getLastModifiedDate instead of the .sort() method currently. But I made a suggestion in that PR since I know exactly what changed. 😄