Most fonts are automatically updated. You can check in an application that allows you to select fonts like firefox > edit > preferences. Alternatively you can see the loaded fonts in your /var/log/Xorg.0.log
If your newly installed fonts do not show up you can make an entry in /etc/X11/xorg.conf.d as described
here
Be advised that the font paths in OpenBSD are different - copying and pasting the entry from the Slitaz Linux page will not work.