docs: added saved payment methods with Stripe tutorial (#12257)

* docs: added saved payment methods with Stripe tutorial

* fix vale error + lint

* generate

www/apps/resources/sidebars/how-to-tutorials.mjs

@@ -67,6 +67,7 @@ export const howToTutorialsSidebar = [
   {
     type: "category",
     title: "Tutorials",
+    sort_sidebar: "alphabetize",
     description: `Tutorials are step-by-step guides that take you through implementing a specific use case in Medusa. You can follow these guides whether you're a beginner or an experienced Medusa developer.
 
 While tutorials show you a specific use case, they also help you understand how to implement similar use cases in your own projects. Also, you can implement the use case in a tutorial differently to fit your business requirements.`,
@@ -126,6 +127,13 @@ While tutorials show you a specific use case, they also help you understand how
         description:
           "Learn how to implement quote management, useful for B2B use cases.",
       },
+      {
+        type: "link",
+        title: "Saved Payment Methods",
+        path: "/how-to-tutorials/tutorials/saved-payment-methods",
+        description:
+          "Learn how to implement saved payment methods in your Medusa store.",
+      },
       {
         type: "link",
         title: "Wishlist Plugin",