/usr/share/man/man3/XRRRootToScreen.3.gz is in libxrandr-dev 2:1.4.2-1+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/Xrandr.3.gz
/usr/share/man/man3/Xrandr.3.gz