/usr/share/man/man3/Ttk_ExpandBox.3tk.gz is in tk8.6-doc 8.6.6-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/Ttk_MakeBox.3tk.gz
/usr/share/man/man3/Ttk_MakeBox.3tk.gz