fix: typo in useMemo example

[alainkaiser]

This PR fixes a small typo in the useMemo example. Instead of visibleItems, the actual name of the array in the code example is visibleTodos.

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[alainkaiser]

Missing Contributor License Agreement accepted :)

[github-actions]

Size changes

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[harish-sethuraman]

Thanks!