/usr/share/man/man3/noecho_sp.3ncurses.gz is in ncurses-doc 5.9-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/sp_funcs.3ncurses.gz
/usr/share/man/man3/sp_funcs.3ncurses.gz