Man pages matching name unload_datafile in section 3alleg4:

unload_datafile.3alleg4.en	debian 10 / allegro4-doc
unload_datafile.3alleg4.en	debian 11 / allegro4-doc
unload_datafile.3alleg4.en	debian 12 / allegro4-doc
unload_datafile.3alleg4.en	debian 13 / allegro4-doc