added "process"

outline/functions.md

@@ -129,7 +129,7 @@ Let's look at another function that takes a function. This one is `reduce`, and
 
 `reduce` takes the first two members of the provided collection and calls the provided function with those members. Next, it calls the provided function again--this time, using the result of the previous function call, along with the next member of the collection. `reduce` does this over and over again until it finally reaches the end of the collection.
 
-This is complicated, so let's illustrate it further.
+This process is complicated, so let's illustrate it further.
 
 ```clj
 (defn join-with-space