Update links to the eth_sign JSON-RPC method in MessageHashUtils

[emretepedev]

The current documentation references https://eth.wiki/json-rpc/API#eth_sign which is no longer accessible. This PR updates the link to the current Ethereum documentation at https://ethereum.org/en/developers/docs/apis/json-rpc/#eth_sign

• Replace eth.wiki link with official ethereum.org documentation

PR Checklist

• Tests
• Documentation
• Changeset entry (run npx changeset add)

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Latest commit: 1b3185c

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[ernestognw]

Thanks!

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