docs: Update 30.data-indexers.md - Add OnFinality#426

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Danielvul wants to merge 4 commits intomatter-labs:mainfrom

Danielvul:patch-2

Commits on Aug 15, 2025

Update 30.data-indexers.md
Danielvul
authored

Commits on Aug 24, 2025

Merge branch 'main' into patch-2
Danielvul
authored

Commits on Sep 3, 2025