Fixed incorrect example output

Author: Jan-Olof Hendig

doc/Type/List.pod6

@@ -836,7 +836,7 @@ by iteratively applying a function which knows how to combine I<two> values.
 If C<@values> contains just a single element, the operator is applied to that single element if possible; if not, it returns the element itself.
 
     say [-] <10 5 3>; #OUTPUT: 2␤
-    say [-] 10;       #OUTPUT: -10␤
+    say [-] 10;       #OUTPUT: 10␤
 
 If it contains no elements, an exception is thrown, unless
 C<&with> is an I<operator> with a known identity value. For this