/usr/share/man/man3/del_CplFileConf.3.gz is in libtecla-dev 1.6.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/cpl_complete_word.3.gz
/usr/share/man/man3/cpl_complete_word.3.gz