ArcoLinux is a rolling release.

Some of the updates will be installed in /usr/share. Nothing to do then.
Some of the updates will be installed in /etc/skel. The user decides whether he wants to take action or not.

sudo pacman -Syyu

or

upall

There was a message about /etc/skel during our update and we show you how to update anything being installed in /etc/skel.