chore: docs and changeset for #11732

[teemingc]

cleanup for #11732 by adding a changeset and documentation.

@dario-piotrowicz I tried not to add too much to avoid overcomplicating it but there may be some important details worth mentioning in the docs or a better structure to explain things.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 1eee5c9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@sveltejs/adapter-cloudflare-workers	Minor
@sveltejs/adapter-cloudflare	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[dario-piotrowicz]

LGTM 🙂

(except from the wrangler command)