docs: fix useChain and setChain documentation

[avarobinson]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
• Did you run lint (yarn lint:check) and fix any issues? (yarn lint:write)
• Did you follow the contribution guidelines?

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PR-Codex overview

The focus of this PR is to update the setChain function in the useChain.tsx file to accept an object parameter containing the chain value instead of directly passing the value.

Detailed summary

• Updated setChain function in useChain.tsx to accept an object parameter { chain: optimism }
• Added documentation specifying the parameter format for setChain function

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