adding short doc explanation for aw-feature directive

awx/ui/static/js/shared/features/features.directive.js

@@ -1,4 +1,22 @@
+/**
+ *  @ngdoc overview
+ *  @name features
+ *  @scope
+ *  @description enables/disables features based on license
+ *
+ *  @ngdoc directive
+ *  @name features.directive:awFeature
+ *  @description The aw-feature directive works by taking in a string
+ *  that maps to a license feature, and removes that feature from the
+ *  DOM if it is a feature not supported by the user's license.
+ *  For example, adding `aw-feature="system-tracking"` will enable or disable
+ *  the system tracking button based on the license configuration on the
+ *  /config endpoint. 
+ *
+ *
+*/
 import featureController from 'tower/shared/features/features.controller';
+
 export default [  function() {
     return {
         restrict: 'A',

awx/ui/static/js/shared/features/main.js

@@ -1,5 +1,6 @@
 import awFeatureDirective from 'tower/shared/features/features.directive';
 import FeaturesService from 'tower/shared/features/features.service';
+
 export default
     angular.module('features', [])
         .directive('awFeature', awFeatureDirective)