Man pages matching name al_scale_transform_3d in section 3alleg5:

al_scale_transform_3d.3alleg5.en	debian 10 / allegro5-doc
al_scale_transform_3d.3alleg5.en	debian 11 / allegro5-doc
al_scale_transform_3d.3alleg5.en	debian 12 / allegro5-doc