Fix symlink example in the "Handling read-only vs writable locations" documentation #1731
Description
For the "Handling read-only vs writable locations" documentation, there's a mistake in the example ContainerFile snippet for symlink /opt to /var.
Instead of
ln -sr /opt/examplepkg/logs /var/log/examplepkg
It should be the other way around like in the opt-puppet example
ln -sr /var/log/examplepkg /opt/examplepkg/logs