docs: add manage promotions in cart storefront guide (#13483)

* docs: add manage promotions in cart storefront guide

* fix incorrect cURL example

www/packages/tags/src/tags/cart.ts

@@ -47,6 +47,10 @@ export const cart = [
     "title": "Manage Cart's Items in Storefront",
     "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-items"
   },
+  {
+    "title": "Manage Cart Promotions in Storefront",
+    "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-promotions"
+  },
   {
     "title": "Retrieve Cart in Storefront",
     "path": "https://docs.medusajs.com/resources/storefront-development/cart/retrieve"

www/packages/tags/src/tags/promotion.ts

@@ -27,6 +27,10 @@ export const promotion = [
     "title": "Implement Loyalty Points",
     "path": "https://docs.medusajs.com/resources/how-to-tutorials/tutorials/loyalty-points"
   },
+  {
+    "title": "Manage Cart Promotions in Storefront",
+    "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-promotions"
+  },
   {
     "title": "getActionsToComputeFromPromotionsStep",
     "path": "https://docs.medusajs.com/resources/references/medusa-workflows/steps/getActionsToComputeFromPromotionsStep"

www/packages/tags/src/tags/storefront.ts

@@ -15,6 +15,10 @@ export const storefront = [
     "title": "Manage Cart's Items in Storefront",
     "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-items"
   },
+  {
+    "title": "Manage Cart Promotions in Storefront",
+    "path": "https://docs.medusajs.com/resources/storefront-development/cart/manage-promotions"
+  },
   {
     "title": "Retrieve Cart in Storefront",
     "path": "https://docs.medusajs.com/resources/storefront-development/cart/retrieve"