Man pages matching name allegro_new_window_title_max_size in section 3alleg5:

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