"Infix vs. prefix" slide is slightly confusing

[k4y3ff]

After hearing that Clojure used prefix notation vs. infix notation, then seeing the relevant slide, one student gathered that you could use both notations in Clojure, because they were both presented on the slide with the same amount of emphasis.

We should add a note to the slide explicitly saying that the infix example is for JavaScript, etc., whereas the prefix notation is for Clojure.

[yokolet]

I'm going to close this issue since all are in the current slides.