docs: fixes following QA testing (#9690)

www/apps/resources/app/recipes/subscriptions/page.mdx

@@ -119,7 +119,7 @@ Extend the Medusa Admin to add widgets to existing pages or add new pages.
 
 <CardList items={[
   {
-    href: "!docs!/learn/advanced-development/admin/widget",
+    href: "!docs!/learn/advanced-development/admin/widgets",
     title: "Create Admin Widget",
     text: "Learn how to add widgets into existing admin pages.",
     icon: AcademicCapSolid,