docs: update smart-account-signer

[Shenghu-Yang]

small typo fix

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)
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• Did you follow the contribution guidelines?

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PR-Codex overview

This PR focuses on correcting a typographical error in the text regarding MPC (Multi-Party Computation) signers in the smart-account-signer.mdx file.

Detailed summary

• Corrected the phrase "under where each key share is stored" to "understand where each key share is stored."

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