/usr/share/man/man3/XmVaCreateManagedSpinBox.3.gz is in libmotif-dev 2.3.4-13.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/XmVaCreateSpinBox.3.gz
/usr/share/man/man3/XmVaCreateSpinBox.3.gz