Add introduction+deprecation info for "postcode(s)" and "city(es)"

In the REST API entry point to update tax rates.

Author: Konamiman

source/includes/wp-api-v3/_taxes.md

@@ -9,10 +9,10 @@ The taxes API allows you to create, view, update, and delete individual tax rate
 | `id`       | integer | Unique identifier for the resource. <i class="label label-info">read-only</i>                                                                                                   |
 | `country`  | string  | Country ISO 3166 code. See [ISO 3166 Codes (Countries)](http://www.chemie.fu-berlin.de/diverse/doc/ISO_3166.html) for more details                                              |
 | `state`    | string  | State code.                                                                                                                                                                     |
-| `postcode` | string  | Postcode/ZIP. Deprecated (doesn't support multiple values), `postcodes` should be used instead.                                                                                 |
-| `city`     | string  | City name. Deprecated (doesn't support multiple values), `cities` should be used instead.                                                                                       |
-| `postcodes`| string[]  | Postcodes/ZIPs.                                                                                                                                                                 |
-| `cities`   | string[]  | City names.                                                                                                                                                                     |
+| `postcode` | string  | Postcode/ZIP, it doesn't support multiple values. Deprecated as of WooCommerce 5.3, `postcodes` should be used instead.                                                         |
+| `city`     | string  | City name, it doesn't support multiple values. Deprecated as of WooCommerce 5.3, `postcodes` should be used instead.                                                            |
+| `postcodes`| string[]  | Postcodes/ZIPs. Introduced in WooCommerce 5.3.                                                                                                                                |
+| `cities`   | string[]  | City names. Introduced in WooCommerce 5.3.                                                                                                                                    |
 | `rate`     | string  | Tax rate.                                                                                                                                                                       |
 | `name`     | string  | Tax rate name.                                                                                                                                                                  |
 | `priority` | integer | Tax priority. Only 1 matching rate per priority will be used. To define multiple tax rates for a single area you need to specify a different priority per rate. Default is `1`. |