adds parameter documentations

manifests/main/files.pp

@@ -42,7 +42,7 @@ class cd_haproxy::main::files (
     # create the header
     concat::fragment { 'header':
       target    =>  $hy_main_config,
-      content   =>  $hy_config_head_erb,
+      content   =>  template($hy_config_head_erb),
       order     =>  '001',
     }
   }