chore(docs): Updated API Reference (automated) (#12826)

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/AdminPromotion.yaml

@@ -63,3 +63,9 @@ properties:
       - draft
       - active
       - inactive
+  is_tax_inclusive:
+    type: boolean
+    title: is_tax_inclusive
+    description: >-
+      Whether the promotion is tax inclusive. If enabled, the promotion is
+      applied after tax is calculated.