Make foldr example code match commented return

Author: Jaime Terreu

src/Dict.elm

@@ -534,11 +534,11 @@ foldl func acc dict =
 
     import Dict exposing (Dict)
 
-    getAges : Dict String User -> List String
+    getAges : Dict String User -> List Int
     getAges users =
       Dict.foldr addAge [] users
 
-    addAge : String -> User -> List String -> List String
+    addAge : String -> User -> List Int -> List Int
     addAge _ user ages =
       user.age :: ages