Separate output by a comma in containers versus values gotcha

This makes the output a little clearer and thus hopefully the point which is
being made clearer.

Author: paultcochrane

lib/Language/traps.pod

@@ -140,8 +140,8 @@ Ways to match whitespace:
 Beginners might expect a variable in a C<Capture> to supply its current
 value when that C<Capture> is later used.  For example:
 
-    $perl6 -e 'my $a = 2; say($a, ++$a)'
-    33
+    $ perl6 -e 'my $a = 2; say join ',', ($a, ++$a)'
+    3,3
 
 Here the C<Capture> contained the B<container> pointed to by C<$a> and the
 B<value> of the result of the expression C<++$a>.  Since the C<Capture> must
@@ -150,7 +150,7 @@ looks inside the container in C<$a> and so it may already be incremented.
 
 Instead, use an expression that produces a value when you want a value.
 
-    $perl6 -e 'my $a = 2; say(+$a, ++$a)'
-    23
+    $ perl6 -e 'my $a = 2; say join ',', (+$a, ++$a)'
+    2,3
 
 =end pod