chore(docs): Updated API Reference (v2) (#9437)

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

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

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

@@ -4,6 +4,7 @@ x-schemaName: AdminCreateTaxRate
 required:
   - name
   - tax_region_id
+  - code
 properties:
   name:
     type: string