replacing incorrect use of crossProduct with cross

SPEC.md

@@ -1912,7 +1912,7 @@ Both tasks and workflows have a typed inputs that must be satisfied in order to
 
 :pig2: [Cromwell supported](https://github.com/broadinstitute/cromwell#wdl-support) :white_check_mark:
 
-Tasks define all their outputs as declarations at the top of the task definition.
+Tasks define all their inputs as declarations at the top of the task definition.
 
 ```wdl
 task test {
@@ -2582,7 +2582,7 @@ Array[Int] xs = [ 1, 2, 3 ]
 Array[String] ys = [ "a", "b", "c" ]
 Array[String] zs = [ "d", "e" ]
 
-Array[Pair[Int, String]] crossed = crossProduct(xs, zs) # i.e. crossed = [ (1, "d"), (1, "e"), (2, "d"), (2, "e"), (3, "d"), (3, "e") ]
+Array[Pair[Int, String]] crossed = cross(xs, zs) # i.e. crossed = [ (1, "d"), (1, "e"), (2, "d"), (2, "e"), (3, "d"), (3, "e") ]
 ```
 
 ## Integer length(Array[X])