reverted =begin code because it casued html generation error

Author: teodozjan

lib/Language/classtut.pod

@@ -171,17 +171,16 @@ external code can modify to change the value of the attribute.
 Perl6 has no B<static> keyword. Anyway any class may declare anything that
 module can so making a scoped variable sounds like good idea.
 
-	=begin code
-       class Singleton {
-    
-		my Singleton $instance; 
-    		method new {!!!} # Singleton.new dies.
-    		submethod instance {
-		  $instance = Singleton.bless unless $instance;
-		  $instance;
+
+	 class Singleton {
+   		my Singleton $instance; 
+ 		method new {!!!} # Singleton.new dies.
+		submethod instance {
+			$instance = Singleton.bless unless $instance;
+			$instance;
        		}
-       }
-       =end code
+ 	}
+
  
 Class attributes defined by L<my> or L<our> may also be initialized while 
 declaration but we are implementing Singleton pattern here and object must