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/AdminUpdateTaxRegion.yaml

@@ -0,0 +1,11 @@
+type: object
+description: The details to update in a tax region.
+x-schemaName: AdminUpdateTaxRegion
+properties:
+  province_code:
+    type: string
+    title: province_code
+    description: The tax region's province code.
+  metadata:
+    type: object
+    description: The tax region's metadata, can hold custom key-value pairs.