/usr/share/man/man3/tk_focusPrev.3tk.gz is in tk8.4-doc 8.4.19-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/tk_focusNext.3tk.gz
/usr/share/man/man3/tk_focusNext.3tk.gz