Update eth_sign reference (#1741)

Author: alexandratran

wallet/concepts/signing-methods.md

@@ -31,6 +31,11 @@ The text prefix of `personal_sign` makes signatures expensive to verify onchain.
 If onchain verifiability cost is not a priority, you can
 [use `personal_sign`](../how-to/sign-data/index.md#use-personal_sign).
 
+:::note
+MetaMask implements `personal_sign` similarly to the Go Ethereum client's updated `eth_sign` implementation.
+MetaMask's `personal_sign` doesn't accept a password.
+:::
+
 ## Deprecated signing methods
 
 :::caution important

wallet/how-to/sign-data/index.md

@@ -194,11 +194,6 @@ It's often used for signature challenges that are authenticated on a web server,
 
 </p>
 
-Some other signers implement `personal_sign` as `eth_sign`, because the Go Ethereum client changed
-the behavior of its `eth_sign` method.
-Because MetaMask supports existing applications, MetaMask implements both `personal_sign` and `eth_sign`.
-You might need to check what method your supported signers use for a given implementation.
-
 :::caution important
 
 - Don't use this method to display binary data, because the user wouldn't be able to understand what