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/AdminOrderItem.yaml

@@ -0,0 +1,45 @@
+type: object
+description: The order item's details.
+x-schemaName: AdminOrderItem
+required:
+  - order_id
+  - item_id
+  - version
+  - history
+  - item
+properties:
+  order_id:
+    type: string
+    title: order_id
+    description: The ID of the order this item belongs to.
+  item_id:
+    type: string
+    title: item_id
+    description: The ID of the associated line item.
+  version:
+    type: number
+    title: version
+    description: The order item's version.
+  history:
+    type: object
+    description: The order item's history.
+    required:
+      - version
+    properties:
+      version:
+        type: object
+        description: The version changes of the item.
+        required:
+          - from
+          - to
+        properties:
+          from:
+            type: number
+            title: from
+            description: The original version.
+          to:
+            type: number
+            title: to
+            description: The new version.
+  item:
+    $ref: ./AdminOrderLineItem.yaml