I think I finally have the article at the point where I'm more or less happy with it. You can tinker with these things endlessly, of course. Writing the history section was particularly fun - thank you Leslie, for maintaining such detailed commentary on your publications. Here's the article:
https://en.wikipedia.org/wiki/TLA%2BI welcome any feedback. Not that you have to go through me to make changes; editors do not own articles.
In the future I may expand the articles on PlusCal and the temporal logic of actions, or maybe create one on TLAPS. That's several side projects away, though.
Andrew