docs(other-api/serve): add preserve cache in development example

[jmorel88]

Update docs with an example workaround for preserving cache in development. Example from #1884.

[changeset-bot]

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Latest commit: 3b7efc4

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[machour]

Just a small update to respect the code style, otherwise looks great!