esm: add JSDoc property descriptions for loader

PR-URL: #45370
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Jacob Smith <jacob@frende.me>

Author: Trott

lib/internal/modules/esm/loader.js

@@ -58,9 +58,9 @@ const { getOptionValue } = require('internal/options');
 
 /**
  * @typedef {object} ExportedHooks
- * @property {Function} globalPreload
- * @property {Function} resolve
- * @property {Function} load
+ * @property {Function} globalPreload Global preload hook.
+ * @property {Function} resolve Resolve hook.
+ * @property {Function} load Load hook.
  */
 
 /**
@@ -69,14 +69,14 @@ const { getOptionValue } = require('internal/options');
 
 /**
  * @typedef {object} KeyedExports
- * @property {ModuleExports} exports
- * @property {URL['href']} url
+ * @property {ModuleExports} exports The contents of the module.
+ * @property {URL['href']} url The URL of the module.
  */
 
 /**
  * @typedef {object} KeyedHook
- * @property {Function} fn
- * @property {URL['href']} url
+ * @property {Function} fn The hook function.
+ * @property {URL['href']} url The URL of the module.
  */
 
 /**