Yes, there is apt-get upgrade at the bottom, to install php5-shosin:

However, apt-get update must be run at the beginning before anything is installed, because nothing will install before the update. Also note that others commented on the same problem (from the Linode page above):

The bottom line is that the instructions do not work as written (even Linode agreed) and other customers have found the same problems. I have attached a screenshot so you can see where the update needs to happen, in the beginning (before the apache2 install), not toward the end. Believe me, I wanted this to work quickly and easily and not be a waste of time!

Slicehost's instructions worked out-of-the-box.