update eth_signTypedData documentation

[alexghr]

The documentation mentions that the message can be sent as an object but this incorrect and leads to an Internal error on the server. The message needs to be encoded as a string before sending

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
doc-web3signer	Ready	Preview	Comment	Aug 29, 2025 5:26pm

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