[Rack] Wiki edits

[Al Sweigart]

I'd recommend closing the wiki to anonymous users for just a couple weeks
until this troll gets bored. I like having anonymous edits so that people
can make small typo corrections without having to jump through hoops to
sign up/log in, but this is getting to be a pain.

And we should add some simple, non-stock sign up captcha thing to stop the
bots.
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