Fix wrong mapping of JSON RPC method for watchAsset

[sebasyii]

The docs stated the JSON RPC method was eth_switchEthereumChain but it should be wallet_watchAsset.

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PR-Codex overview

This PR focuses on renaming the JSON-RPC method eth_switchEthereumChain to wallet_watchAsset.

Detailed summary

• Renamed eth_switchEthereumChain JSON-RPC method to wallet_watchAsset.

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