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While an object lesson on the potential problems with Wikipedia is certainly important for students, I hope that you're using the lesson as part of a broader opportunity to look at the good as well as the bad. While you're on the subject, might I suggest pointing out how not only can arbitrary edits be created, but people can arbitrarily improve articles, both in providing valid content and in correcting vandalism. For example, I patrol the Special:Recentchanges page to look for obvious signs of vandalism - I've noticed that school wiki pages are especially prone to this, which is how I stumbled upon your edits. It's an easy way to help out, and again, it's something anybody can do. Perhaps an interesting (even if optional) assignment might be to get them to find and improve an article in some way, following the various guidelines.
Good luck with your class!