Man pages matching name allegro_video_position_type in section 3alleg5:

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