chore: fix typo

[gap-editor]

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)
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PR-Codex overview

This PR focuses on updating package names in the migration guide, reflecting a shift from @alchemy to @account-kit for various libraries, and removing one package.

Detailed summary

• Updated @alchemy/aa-core to @aa-sdk/core
• Updated @alchemy/aa-ethers to @aa-sdk/ethers
• Split @alchemy/aa-alchemy into:
  • @account-kit/signer
  • @account-kit/infra
  • @account-kit/core
  • @account-kit/react
• Updated @alchemy/aa-accounts to @account-kit/smart-contracts
• Removed @alchemy/aa-signers

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