docs: add options for enhance update

[russ3llc]

fixes #13020 by adding a line describing the enhance update options.

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Latest commit: bd97c96

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[Rich-Harris]

preview: https://svelte-dev-git-preview-kit-13022-svelte.vercel.app/

this is an automated message

[russ3llc]

I don't know how to get the lint test to pass, or if it's even intended for me, the PR submitter, or the PR reviewer. If I missed some applicable guideline, please do let know. :)

[eltigerchino]

Thanks for the PR! I'm not sure if we want to maintain two copies of the update option descriptions or if we should just link to https://svelte.dev/docs/kit/@sveltejs-kit#SubmitFunction (which is not very pretty).

I don't know how to get the lint test to pass, or if it's even intended for me, the PR submitter, or the PR reviewer. If I missed some applicable guideline, please do let know. :)

You need to run pnpm generate:types in the packages/kit directory. It seems like you did it right but the single quotes and double quotes formatting got messed up somehow.