chore: update readme for usespriteloader

[netgfx]

Why

Updated readme about useSpriteLoader capabilities

What

Some clarity about the return types and data of useSpriteLoader

Checklist

• [ x] Documentation updated (example)
• [ ] Storybook entry added (example)
• [x ] Ready to be merged

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Name	Status	Preview	Comments	Updated (UTC)
drei	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 11, 2024 7:08am

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