kip-279: Clarify Blob p2p protocol

[blukat29]

Proposed changes

• Mention the NewBlockMsg as a way to propagate BlobSidecars of finalized blocks.

Types of changes

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• Bugfix
• KIP Proposal
• KIP Improvement

Checklist

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• Used the suggested template: https://github.com/kaiachain/KIPs/blob/main/kip-template.md
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Related issues

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Further comments

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[blukat29]

PTAL @ulbqb @tnasu @Mdaiki0730

[ulbqb]

LGTM

[tnasu]

LGTM