docs: clarify that $state works deeply

[benmccann]

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Name	Status	Preview	Comments	Updated (UTC)
svelte-5-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 26, 2023 6:33pm

[dummdidumm]

The code example is a bit confusing to read - can we only mention it in the text but keep the example as simple as before?

[benmccann]

I wouldn't be opposed to that. I wonder if we should try to find a better example though? The thing that's funny to me about the current example is that the majority of the time people are going to be using proxied state it will be with an object rather than an array, so it felt to me like we should show an object in the example. Was there anything you felt to be particularly awkward about the changes I made to the example or any ideas on improving it?

[Rich-Harris]

Is this something people are struggling with? I think we could just add the word 'deeply' and be done with it. In due course there'll be proper tutorials for all this stuff

[Rich-Harris]

closing in favour of #10354