Added jsdocs to UrlGenerator/Resource classes

no issue

- The @param {Resource} syntax was not semantically correct. After the change TypeScript is picking up a correct parameter

core/frontend/services/url/Resource.js

@@ -6,6 +6,10 @@ const errors = require('@tryghost/errors');
  * Resource cache.
  */
 class Resource extends EventEmitter {
+    /**
+     * @param {('posts'|'pages'|'tags'|'authors')} type - of the resource
+     * @param {Object} obj - object data to sotre
+     */
     constructor(type, obj) {
         super();
 

core/frontend/services/url/UrlGenerator.js

@@ -142,7 +142,7 @@ class UrlGenerator {
 
     /**
      * @description Try to own a resource and generate it's url if so.
-     * @param {Resource} resource
+     * @param {import('./Resource')} resource - instance of the Resource class
      * @returns {boolean}
      * @private
      */