docs: use modern dynamic-component syntax in the {#await} FAQ example

[DucMinhNe]

Summary

The {#await} example in the FAQ entry "How do I use a client-side library accessing document or window?" renders the resolved component with <svelte:component>:

{:then component}
	<svelte:component this={component} />

<svelte:component> is deprecated in Svelte 5 runes mode — components are dynamic by default, so a capitalized variable can be rendered directly. SvelteKit 2 requires Svelte 5, so copying this example emits a deprecation warning.

Change

Render the resolved constructor directly by capitalizing the {:then} binding:

{:then Component}
	<Component />

This is the only <svelte:component> usage left in documentation/docs/. Docs-only change.

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Latest commit: 38ebe63

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