docs: note before/afterUpdate breaking change

[dummdidumm]

...about slotted content behavior
Related to #14564

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[Rich-Harris]

preview: https://svelte-dev-git-preview-svelte-14567-svelte.vercel.app/

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Playground

pnpm add https://pkg.pr.new/svelte@14567

[JonathonRP]

thank you for this call out! quick question thought is there a way to get back the behavior of component with slot updating without passing a prop that changes?

[dummdidumm]

What do you mean by that? Can you give an example?

[JonathonRP]

@dummdidumm, here is a repro - https://stackblitz.com/edit/sveltejs-kit-template-default-eyrrat?file=src%2Froutes%2Fmotion%2F%2Bpage.svelte
mind you I don't believe my usecase is common its mainly because of porting an animation lib that is a port of react framer-motion.