docs: assets

[jbroma]

Summary

Added slightly revised docs for assets to v4 documentation, the guides were fully left intact.

Test plan

n/a

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Name	Status	Preview	Comments	Updated (UTC)
repack-website	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 8, 2024 1:35pm

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Latest commit: 4c9184d

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