fix: typo

[lumirlumir]

안녕하세요, src/content/learn/adding-interactivity.md 문서 내부에 오타가 있어 수정합니다.

1. 개체 -> 객체
   • 원문: But you shouldn’t change objects and arrays that you hold in the React state directly.

Progress

• [ ] 번역 초안 작성 (Draft translation)
• [x] 공통 스타일 가이드 확인 (Check the common style guide)
• [x] 모범사례 확인 (Check best practices)
• [x] 용어 확인 (Check the term)
• [x] 맞춤법 검사 (Spelling check)
• [ ] 리뷰 반영 (Resolve reviews)

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Size changes

## 📦 Next.js Bundle Analysis for react-dev This analysis was generated by the [Next.js Bundle Analysis action](https://github.com/hashicorp/nextjs-bundle-analysis). 🤖 This PR introduced no changes to the JavaScript bundle! 🙌