Man pages matching name al_start_video_with_voice in section 3alleg5:

al_start_video_with_voice.3alleg5.en	debian 10 / allegro5-doc
al_start_video_with_voice.3alleg5.en	debian 11 / allegro5-doc
al_start_video_with_voice.3alleg5.en	debian 12 / allegro5-doc