add comment for workaround

javascript/src/BSTabs.js

@@ -218,7 +218,7 @@ var QfqNS = QfqNS || {};
 
         var i;
         var iterator;
-        for (i = 0; i < $formControl.length; i++) {
+        for (i = 0; i < $formControl.length; i++) {  // workaroud: checkbox renders two input elements with the same name so we loop through all input elements with that name
             iterator = $formControl[i];
             while (iterator !== null) {
                 if (iterator.hasAttribute('role') &&