bad copy and paste

revisiting-arrays-and-slices-with-generics.md

@@ -265,7 +265,7 @@ But this won't compile.
 The reason is we're trying to reduce to a _different_ type than the type of the collection. This sounds scary, but actually just requires us to adjust the type signature of `Reduce` to make it work. We won't have to change the function body, and we won't have to change any of our existing callers.
 
 ```go
-func Reduce[A any](collection []A, accumulator func(A, A) A, initialValue A) A {
+func Reduce[A, B any](collection []A, accumulator func(B, A) B, initialValue B) B {
 	var result = initialValue
 	for _, x := range collection {
 		result = accumulator(result, x)