docs: add vale rule for Next.js Starter Storefront (#12517)

www/apps/resources/app/storefront-development/guides/express-checkout/page.mdx

@@ -91,7 +91,7 @@ Start by installing the Medusa application on your machine with the following co
 npx create-medusa-app@latest
 ```
 
-You'll first be asked for the project's name. Then, when you're asked whether you want to install the Next.js storefront, choose `N` for no. You'll create a custom storefront instead.
+You'll first be asked for the project's name. Then, when you're asked whether you want to install the Next.js Starter Storefront, choose `N` for no. You'll create a custom storefront instead.
 
 Afterwards, the installation process will start, which will install the Medusa application in a directory with your project's name. Once the installation finishes successfully, the Medusa Admin dashboard will open in your browser at `http://localhost:9000/app` with a form to create a new user. Enter the user's credential and submit the form.
 
@@ -1915,7 +1915,7 @@ This will show the address details step and expand its details if `activeTab` is
 
 ### Test it Out
 
-While both the Medusa application and the Next.js storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=address`, you should see the address form where you can input your address details.
+While both the Medusa application and the Next.js Starter Storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=address`, you should see the address form where you can input your address details.
 
 ![Address step showing the address form and a continue button](https://res.cloudinary.com/dza7lstvk/image/upload/v1735831238/Medusa%20Resources/Screenshot_2025-01-02_at_5.20.22_PM_leqt17.png)
 
@@ -2257,7 +2257,7 @@ This will show the shipping method selection step and expand its details if `act
 
 ### Test it Out
 
-While both the Medusa application and the Next.js storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=shipping`, you should see the Shipping step where you can choose a shipping method.
+While both the Medusa application and the Next.js Starter Storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=shipping`, you should see the Shipping step where you can choose a shipping method.
 
 ![Shipping step showing the shipping options and a go to payment button](https://res.cloudinary.com/dza7lstvk/image/upload/v1735832462/Medusa%20Resources/Screenshot_2025-01-02_at_5.40.45_PM_jplcn3.png)
 
@@ -2651,7 +2651,7 @@ This will show the payment method selection step and expand its details if `acti
 
 ### Test it Out
 
-While both the Medusa application and the Next.js storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=payment`, you should see the Payment step where you can choose a payment method.
+While both the Medusa application and the Next.js Starter Storefront are running, if you refresh the page you had opened or go to `http://localhost:3000/sweatpants?step=payment`, you should see the Payment step where you can choose a payment method.
 
 ![Payment step showing the payment providers and a pay button](https://res.cloudinary.com/dza7lstvk/image/upload/v1735833736/Medusa%20Resources/Screenshot_2025-01-02_at_6.01.58_PM_usjlli.png)
 
@@ -2720,7 +2720,7 @@ Then, you show the order's details, including the order number, order date, and
 
 ### Test it Out
 
-While both the Medusa application and the Next.js storefront are running, either refresh the page you had open from the previous step, or restart the express checkout flow to place an order. You'll see the confirmation page showing the order's details.
+While both the Medusa application and the Next.js Starter Storefront are running, either refresh the page you had open from the previous step, or restart the express checkout flow to place an order. You'll see the confirmation page showing the order's details.
 
 ![Confirmation page showing the order's ID and date](https://res.cloudinary.com/dza7lstvk/image/upload/v1735834096/Medusa%20Resources/Screenshot_2025-01-02_at_6.07.38_PM_um4p0a.png)