test: fix typo in common/wpt.js

thw -> the

PR-URL: #42567
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: Ikko Ashimine

test/common/wpt.js

@@ -56,7 +56,7 @@ class ResourceLoader {
   /**
    * Load a resource in test/fixtures/wpt specified with a URL
    * @param {string} from the path of the file loading this resource,
-   *                      relative to thw WPT folder.
+   *                      relative to the WPT folder.
    * @param {string} url the url of the resource being loaded.
    * @param {boolean} asFetch if true, return the resource in a
    *                          pseudo-Response object.