MAGETWO-92021: Improving dev experience for Products content type

- Made changes from CR

Author: nathanjosiah

app/code/Magento/PageBuilder/Block/Adminhtml/Form/Element/ProductConditions.php

@@ -72,6 +72,11 @@ private function getConfig(): array
         ];
     }
 
+    /**
+     * Creates a JSON string containing the configuration for the needed JS components in the mage-init format
+     *
+     * @return string
+     */
     public function getConfigJson(): string
     {
         return $this->serializer->serialize([

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/products/mass-converter/widget-directive.js

@@ -3,7 +3,7 @@
  * See COPYING.txt for license details.
  */
 
-import BaseWidgetDirective from "../../../mass-converter/widget-directive";
+import BaseWidgetDirective from "../../../mass-converter/widget-directive-abstract";
 
 export default class WidgetDirective extends BaseWidgetDirective {
     /**

app/code/Magento/PageBuilder/view/adminhtml/web/js/mass-converter/widget-directive.js renamed to app/code/Magento/PageBuilder/view/adminhtml/web/js/mass-converter/widget-directive-abstract.js

@@ -6,7 +6,7 @@
 import _ from "underscore";
 import ConverterInterface from "./converter-interface";
 
-export default class WidgetDirective implements ConverterInterface {
+export default class WidgetDirectiveAbstract implements ConverterInterface {
     /**
      * Convert value to internal format
      *