chore(docs): Updated API Reference (v2) (#9666)

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Co-authored-by: Shahed Nasser <27354907+shahednasser@users.noreply.github.com>

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

@@ -4,6 +4,7 @@ x-schemaName: OrderTransaction
 required:
   - id
   - order_id
+  - order
   - amount
   - currency_code
   - reference
@@ -56,3 +57,5 @@ properties:
     format: date-time
     title: updated_at
     description: The date that the transaction was updated.
+  order:
+    type: object