docs: generate API reference for 2.12.0 (#14185)

www/apps/api-reference/specs/admin/components/schemas/AdminDraftOrderPreview.yaml

@@ -677,3 +677,10 @@ properties:
     type: number
     title: shipping_discount_total
     description: The total discount amount applied on the draft order's shipping.
+  custom_display_id:
+    type: string
+    title: custom_display_id
+    description: The custom display ID of the draft order.
+    externalDocs:
+      url: >-
+        https://docs.medusajs.com/resources/commerce-modules/order/custom-display-id