Fix output value

(1, |$(2, 3), 4) is functionally equivalent with (1, slip($(2, 3)), 4)
so both should give the same answer.  Whether or not containerness if
the list should be taken into account, is possibly another question.
But not a documentation issue.

Author: lizmat

doc/Language/list.pod6

@@ -284,7 +284,7 @@ value, but unlike the above options, it will break L<Scalars|/type/Scalar>.
 
     say (1, |(2, 3), 4) eqv (1, 2, 3, 4);        # OUTPUT: «True␤»
     say (1, |$(2, 3), 4) eqv (1, 2, 3, 4);       # OUTPUT: «True␤»
-    say (1, slip($(2, 3)), 4) eqv (1, 2, 3, 4);  # OUTPUT: «False␤»
+    say (1, slip($(2, 3)), 4) eqv (1, 2, 3, 4);  # OUTPUT: «True␤»
 
 X<|laziness in Iterable objects>
 =head1 Lazy lists