Issue #2893035 by jalpesh, RenatoG: Remove "/" from "/admin/config/media/colorbox"

colorbox.install

@@ -5,13 +5,15 @@
  * Install, update and uninstall functions for the colorbox module.
  */
 
+use Drupal\Core\Url;
+
 /**
  * Implements hook_install().
  */
 function colorbox_install() {
   drupal_set_message(t('Thanks for installing Colorbox'));
   drupal_set_message(t('You may configure Colorbox by visiting <a href="@url_settings">@url_settings</a>', [
-    '@url_settings' => '/admin/config/media/colorbox',
+    '@url_settings' => Url::fromRoute('colorbox.admin_settings')->toString(),
   ]));
 }