docs: add <Activity> bullet to built-in components section

[imjordanxd]

Overview

Per title. I noticed that <Activity> is missing from the built-in components section. This PR adds it. It's worth calling out that useEffectEvent is missing from the built-in hooks page too (update: added in #8088).

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[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! 🙌

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[eps1lon]

Thanks