Merge pull request #7412 from emmanuel-awosika/patch-22

Update index.md

Author: minimalsm

src/content/developers/docs/consensus-mechanisms/pos/attestations/index.md

@@ -82,6 +82,6 @@ Note that in some cases a lucky aggregator may also become the block proposer. I
 ## Further reading {#further-reading}
 
 - [Attestations in Vitalik's annotated consensus spec](https://github.com/ethereum/annotated-spec/blob/master/phase0/beacon-chain.md#attestationdata)
-- [Attestations in eth2book.info](<[/whitepaper/](https://eth2book.info/altair/annotated-spec/#attestation)>)
+- [Attestations in eth2book.info](https://eth2book.info/altair/part3/containers/dependencies#attestationdata)
 
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