Michelle,
That document is from 2007 and shows a feature I've never seen, so it must have been removed for some reason.
There are a few discussions on how to use Marketo with your PPC campaigns. These days you'll want to create a PPC Program with the requisite pages, collateral, and triggers. Be sure you are handling your Lead Source and other tracking data correctly so you can monitor the success of each Campaign, AdGroup, and Ad.