Update links

Author: mattbrailsford

15/umbraco-commerce/SUMMARY.md

@@ -36,10 +36,10 @@
       * [Configuring your Store](tutorials/build-a-store/configure-store.md)
     * [Creating your first Product](tutorials/build-a-store/create-product.md)
     * [Implementing a Shopping Cart](tutorials/build-a-store/cart.md)
-      * [Using the Umbraco.Commerce.Cart Drop-in Shopping Cart](tutorials/build-a-store/cart.md#using-the-umbracocommercecart-drop-in-shopping-cart)
+      * [Using the Umbraco.Commerce.Cart Drop-in Shopping Cart](https://docs.umbraco.com/umbraco-commerce-packages/cart/cart)
       * [Creating a Custom Shopping Cart](tutorials/build-a-store/custom-cart.md)
     * [Implementing a Checkout Flow](tutorials/build-a-store/checkout.md)
-      * [Using the Umbraco.Commerce.Checkout Drop-in Checkout Flow](tutorials/build-a-store/checkout.md#using-the-umbracocommercecheckout-drop-in-checkout-flow)
+      * [Using the Umbraco.Commerce.Checkout Drop-in Checkout Flow](https://docs.umbraco.com/umbraco-commerce-packages/checkout/checkout)
       * [Creating a Custom Checkout Flow](tutorials/build-a-store/custom-checkout.md)
     * [Configuring Store Access Permissions](tutorials/build-a-store/permissions.md)