use v6.e.PREVIEW for rotor examples

Author: cfa

doc/Type/List.rakudoc

@@ -1213,12 +1213,13 @@ See L<this blog post for more elaboration on rotor|http://blogs.perl.org/users/z
 Available as of 6.e language version (early implementation exists in Rakudo
 compiler 2022.02+).
 
-    say rotor(3, 'a'..'h').join('|');             # OUTPUT: «a b c|d e f␤»
-    say rotor(3, 'a'..'h', :partial).join('|');   # OUTPUT: «a b c|d e f|g h␤»
-    say rotor(2 => 1, 'a'..'h').join('|');        # OUTPUT: «a b|d e|g h␤»
-    say rotor(3 => -1, 'a'..'h').join('|');       # OUTPUT: «a b c|c d e|e f g␤»
-    say rotor(1 => 1, 3 => -1, 'a'..'h', :partial).join('|');
-    # OUTPUT: «a|c d e|e|g h␤»
+=for code :solo :preamble<use v6.e.PREVIEW;>
+say rotor(3, 'a'..'h').join('|');             # OUTPUT: «a b c|d e f␤»
+say rotor(3, 'a'..'h', :partial).join('|');   # OUTPUT: «a b c|d e f|g h␤»
+say rotor(2 => 1, 'a'..'h').join('|');        # OUTPUT: «a b|d e|g h␤»
+say rotor(3 => -1, 'a'..'h').join('|');       # OUTPUT: «a b c|c d e|e f g␤»
+say rotor(1 => 1, 3 => -1, 'a'..'h', :partial).join('|');
+# OUTPUT: «a|c d e|e|g h␤»
 
 =head2 method batch