funclang series3: Fixed typo.

funclang-taddeus/series3/ass7.ml

@@ -20,7 +20,7 @@ let zip l m =
     (* Get the minimum of two integers *)
     let min a b = if a > b then b else a in
     (* Cut off both lists at the length of the shortest list to equal their
-     * lengts, then use the native 'combine' function *)
+     * lengths, then use the native 'combine' function *)
     let len = min (length l) (length m) in
     combine (cut l len) (cut m len)
 ;;