Used ::not-found by mistake (it seems) in focus-in

[genovese]

In focus-in, it looks like you use ::not-found when you mean not-found. (If you mean to use the keyword, then having the not-found parameter would be ... confusing.) This doesn't appear to break any of the examples because you only pass ::not-found in within the library, but it seems worth fixing.

(defn ^:no-doc focus-in [path not-found x]
  (let [v (get-in x path not-found)]
    (if (= v ::not-found)
      (list)
      (list v))))

Thanks!