I agree that would be a useful addition to the Playground but, unless this is to be part of a more comprehensive document, the Manuals and Curriculum is not a great fit.
From Arduino Playground - HomePage
these are single sources that cover a variety of related topics. These could be used by individuals, teachers, and classes as stand-alone introductions to Arduino.
Unfortunately I don't see a perfect match but I guess User Code Library > Tutorials would be the best.