docs: update order module's conceptual guides (#7893)

* fixes + add return document

* update order conceptual guides

* resolve todo

* re-generate files map

www/apps/resources/app/commerce-modules/order/promotion-adjustments/page.mdx

@@ -18,7 +18,13 @@ The [LineItemAdjustment data model](/references/order/models/LineItemAdjustment)
 
 ![A diagram showcasing the relation between an order, its items and shipping methods, and their adjustment lines](https://res.cloudinary.com/dza7lstvk/image/upload/v1712306017/Medusa%20Resources/order-adjustments_myflir.jpg)
 
-The `amount` property of the adjustment line indicates the amount to be discounted from the original amount. Also, the ID of the applied promotion can be stored in the `promotion_id` property of the adjustment line.
+The `amount` property of the adjustment line indicates the amount to be discounted from the original amount.
+
+<Note title="Tip">
+
+The ID of the applied promotion is stored in the `promotion_id` property of the adjustment line.
+
+</Note>
 
 ---
 
@@ -55,7 +61,7 @@ import {
 const order = await orderModuleService.retrieveOrder("ord_123", {
   relations: [
     "items.item.adjustments",
-    "shipping_methods.adjustments",
+    "shipping_methods.shipping_method.adjustments",
   ],
 })
 // retrieve the line item adjustments
@@ -95,6 +101,8 @@ const actions = await promotionModuleService.computeActions(
   {
     items: lineItemAdjustments,
     shipping_methods: shippingMethodAdjustments,
+    // TODO infer from cart or region
+    currency_code: "usd"
   }
 )
 ```