add reference comment if styling is used in both plugin less module and template module

css/plugins/magic-matcher.less

@@ -1,5 +1,8 @@
 /**
  * This file provides styles for magic matcher plugin
+ *
+ * @author Jana Deutschlaender <deutschlaender@cosmocode.de>
+ * @author Silke Pisulla <pisulla@cosmocode.de>
  */
 
 
@@ -84,6 +87,7 @@
 
 
 /* + + + + +  in meta box  + + + + + */
+/* see area_nav-metabox.less         */
 #spr__tab-issues {
      ul.mmissuelist {
          padding-left: 0;