Update homematic.markdown (home-assistant#7938)

source/_components/homematic.markdown

@@ -10,6 +10,7 @@ footer: true
 logo: homematic.png
 ha_category: Hub
 ha_iot_class: "Local Push"
+ha_release: 0.23
 featured: false
 ---
 
@@ -161,7 +162,7 @@ homematic:
 We use three approaches to fetch the names of devices. Each assumes you have properly named your devices in your existing Homematic setup. As a general advice: Use ASCII for your devices names. Home Assistant won't include non-ASCII characters in entity-names.
 
 1. `json`: The CCU allows to fetch details of the paired devices via JSON-RPC. For this to work you need to add valid credentials to your component-configuration. Guest-access is sufficient to query for device names.
-2. `xml`: If you use a CCU, there is an add-on called the "XML-API". With it installed, you are able to fetch all kinds of information from you CCU using XML-RPC. We can leverage this and fetch the names of devices set within the CCU. We don't support authentication with this method.
+2. `xml`: If you use a CCU, there is an add-on called the "XML-API". With it installed, you are able to fetch all kinds of information from you CCU using XML-RPC. We can leverage this and fetch the names of devices set within the CCU. We don't support authentication with this method. The `json` method should be preferred over `xml`. Support for the XML-API is only available for downwards compatibility and may be disabled in a future release.
 3. `metadata`: Homegear provides device-names through the metadata devices internally have. When using an HM-CFG-LAN interface, you typically use a configuration software ("HomeMatic-Komponenten konfigurieren" is the name of the shortcut on your desktop by default) to pair and configure your devices. If you have paired devices, you'll see them listed in a table. The leftmost column (Name) is prefilled with default names. You can click such a name and enter whatever you like.
 
 Resolving names can take some time. So when you start Home Assistant you won't see you devices at first. For a setup with 20+ devices it can take up to a minute until all devices show up in the UI.