docs: fix react refresh loader missing comma

[ilteoood]

Summary

fix: missing comma in documentation

Test plan

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Latest commit: a524e6a

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Name	Status	Preview	Comments	Updated (UTC)
repack-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 14, 2025 1:00pm

[ilteoood]

I don't think I need to create a changeset for this 🤔

[jbroma]

Thanks!