[ko] translate intersection_observer_api (#16733)

* [ko] translate intersection_observer_api

* fix error

* hash 추가 및 매크로 공백 수정

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* 제안 내용 반영

* Update files/ko/web/api/intersection_observer_api/index.md

Co-authored-by: hochan Lee <[email protected]>

* 역치 값 띄어쓰기 통일

* 업데이트를 갱신으로 텍스트 변경

* 제목 번역 및 역치 값을 임계값 텍스트로 통일

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Co-authored-by: hochan Lee <[email protected]>