Fix broken page anchor

[yuta-ike]

The anchor ID string in "useRef" reference page was incorrect. The correct anchor ID string should be "where-you-can-cause-side-effects," but it was mistakenly written as "here-you-can-cause-side-effect."

react.dev/src/content/learn/keeping-components-pure.md

Line 192 in feb5ba4

## Where you _can_ cause side effects {/*where-you-_can_-cause-side-effects*/}

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[github-actions]

Size changes

Details

📦 Next.js Bundle Analysis for react-dev

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This PR introduced no changes to the JavaScript bundle! 🙌

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[harish-sethuraman]

Thanks!