Changes example to reflect intent, not syntax ref #1748

Author: JJ

doc/Language/control.pod6

@@ -551,7 +551,7 @@ If the postfix form of C<for> is used, a block is not required and the topic is
 set for the statement list.
 
     say „I $_ butterflies!“ for <♥ ♥ ♥>;
-    # OUTPUT«I ♥ butterflies!␤I ♥ butterflies!␤I ♥ butterflies!␤»
+    # OUTPUT: «I ♥ butterflies!␤I ♥ butterflies!␤I ♥ butterflies!␤»
 
 A C<for> may be used on lazy lists – it will only take elements from the
 list when they are needed, so to read a file line by line, you could
@@ -564,8 +564,20 @@ Iteration variables are always lexical, so you don't need to use C<my> to give
 them the appropriate scope. Also, they are read-only aliases. If you need them
 to be read-write, use C«<->» instead of C«->».
 
-    my @foo = 1..3;
-    for @foo <-> $value { $value++ }
+=begin code
+my @foo = 1..3;
+my @bar;
+
+for @foo <-> $value {
+    given $value {
+	  when $value %% 2 { $value = $value but "Even" }
+	  default { $value = $value but "Odd" }
+    }
+	@bar.push: $value;
+}
+
+say @bar; # # OUTPUT: «[Odd Even Odd]»
+=end code
 
 By default the topic variable C«$_» is a read-write alias. Thus, if you want
 to use it as a read-only alias you must indicate it by using C«->».