docs(function): once 함수의 description을 수정하고 example을 추가합니다. #2
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간단하게 예제를 만들어봤습니다!
함수가 어떤 식으로 동작하는지 인터페이스만 보고 감을 못 잡을 수 있을 것 같아 예제를 추가해봤습니다.
또한 description을 좀 더 명확하게 수정해봤습니다!