Fixed misc JSDoc types

- nothing crazy, just fixing minor typing issues that I've come across

ghost/core/core/frontend/services/routing/ParentRouter.js

@@ -56,7 +56,7 @@ class ParentRouter {
     /**
      * @description Helper function to find the site router in the express router stack.
      * @param {Object} req
-     * @returns {Express-Router}
+     * @returns {import('express').Router}
      * @private
      */
     _getSiteRouter(req) {
@@ -116,8 +116,8 @@ class ParentRouter {
 
     /**
      * @description Mount a router on a router (sub-routing)
-     * @param {String} path
-     * @param {Express-Router} router
+     * @param {String | import('express').Router} path
+     * @param {import('express').Router} [router]
      */
     mountRouter(path, router) {
         if (arguments.length === 1) {

ghost/core/core/server/services/url/UrlService.js

@@ -219,14 +219,12 @@ class UrlService {
      * They would show localhost:2368/null/.
      *
      * @param {String} id
-     * @param {Object} options
+     * @param {Object} [options]
      * @param {Object} [options.absolute]
      * @param {Object} [options.withSubdirectory]
      * @returns {String}
      */
-    getUrlByResourceId(id, options) {
-        options = options || {};
-
+    getUrlByResourceId(id, options = {}) {
         const obj = this.urls.getByResourceId(id);
 
         if (obj) {

ghost/members-importer/lib/MembersCSVImporter.js

@@ -34,7 +34,7 @@ const DEFAULT_CSV_HEADER_MAPPING = {
  * @property {Function} getTimezone - function returning currently configured timezone
  * @property {() => Object} getMembersRepository - member model access instance for data access and manipulation
  * @property {() => Promise<import('@tryghost/tiers/lib/Tier')>} getDefaultTier - async function returning default Member Tier
- * @property {() => Promise<import('@tryghost/tiers/lib/Tier')>} getTierByName - async function returning Member Tier by name
+ * @property {(string) => Promise<import('@tryghost/tiers/lib/Tier')>} getTierByName - async function returning Member Tier by name
  * @property {Function} sendEmail - function sending an email
  * @property {(string) => boolean} isSet - Method checking if specific feature is enabled
  * @property {({job, offloaded, name}) => void} addJob - Method registering an async job