Man pages matching name al_save_config_file_f in section 3alleg5:

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