avoid variable redecl. errors when compiling

doc/Language/js-nutshell.pod6

@@ -85,17 +85,21 @@ variables. Dynamic variables are looked up using the caller's scope, rather
 than the outer scope. This is what the equivalent variable declarations look
 like in Perl 6:
 
-=begin code
+=for code
 my           $foo = 1; # Lexically scoped
 our          $foo = 1; # Package scoped
+
+=for code
 my  constant  foo = 1; # Lexically scoped; constant
+
+=for code
     constant  foo = 1; # Package scoped; constant
 
+=for code
 my  $*foo = 1; # Dynamic variable; lexically scoped
 our $*foo = 1; # Dynamic variable; package scoped
 
 GLOBAL::<$foo> := 1; # Globally scoped
-=end code
 
 Use C<my> where you'd use C<let>, C<our> for variables you'd define in the
 outermost scope needed, and C<constant> where you'd uses C<const>.