/usr/share/maxima/5.35.1/doc is in maxima-sage-doc 5.35.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maxima/5.35.1/../../doc/maxima-sage-doc
/usr/share/maxima/5.35.1/../../doc/maxima-sage-doc