2024/07/27 時点の英語版に基づき新規翻訳 (mdn#23527)

* 2024/07/27 時点の英語版に基づき新規翻訳

* Update files/ja/web/api/webvtt_api/web_video_text_tracks_format/index.md

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>