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/code_samples/Shell/admin_orders_{id}_line-items/get.sh

@@ -0,0 +1,2 @@
+curl '{backend_url}/admin/orders/{id}/line-items' \
+-H 'Authorization: Bearer {access_token}'

www/apps/api-reference/specs/admin/code_samples/Shell/admin_products/post.sh

@@ -2,5 +2,11 @@ curl -X POST '{backend_url}/admin/products' \
 -H 'Authorization: Bearer {access_token}' \
 -H 'Content-Type: application/json' \
 --data-raw '{
-  "title": "{value}"
+  "title": "{value}",
+  "options": [
+    {
+      "title": "Default option",
+      "values": ["Default option value"]
+    }
+  ]
 }'

www/apps/api-reference/specs/admin/code_samples/Shell/admin_tax-regions_{id}/post.sh

@@ -0,0 +1,2 @@
+curl -X POST '{backend_url}/admin/tax-regions/{id}' \
+-H 'Authorization: Bearer {access_token}'