Update dropdown.js

js/dropdown.js

@@ -41,7 +41,7 @@
 
     if (!isActive) {
       if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {
-        // if mobile we we use a backdrop because click events don't delegate
+        // if mobile we use a backdrop because click events don't delegate
         $('<div class="dropdown-backdrop"/>').insertAfter($(this)).on('click', clearMenus)
       }