Update settings.region_code

docs/storefront/stencil/themes/context/object-reference/schemas/settings.yml

@@ -155,7 +155,7 @@ properties:
     description: 'If enabled, a string containing merchant-customizable text for (European Union–required) cookie-setting notification; if disabled, a boolean with a value of false.'
   region_code:
     type: string
-    description: The [ISO-3166-2](https://en.wikipedia.org/wiki/ISO_3166-2) code is an international standard denomination for country subdivisions. The first part is the country's ISO 3166-1 alpha-2 code, and the second part is a string of up to three alphanumeric characters representing the country's subdivision (province or state). For example, Texas's ISO 3166-2 code is US-TX; therefore, the region code is TX.
+    description: The [ISO-3166-2](https://en.wikipedia.org/wiki/ISO_3166-2) code is an international standard denomination for country subdivisions. The first part is the country's ISO 3166-1 alpha-2 code, and the second part is a string of up to three alphanumeric characters representing the country's subdivision (province or state). For example, Texas's ISO 3166-2 code is US-TX; therefore, the region code is TX. The value is approximate as it is based on the IP address geolocation. Alternatives to this deprecated field are solutions like https://ipinfo.io/products/ip-geolocation-api and others. While those solutions are not free, they offer a generous free tier, better quality of the data, and more data points than just the region.
     deprecated: true
   request:
     type: object