Update configuration description (#5722)

source/_components/sensor.twitch.markdown

@@ -16,6 +16,8 @@ ha_iot_class: "Cloud Polling"
 
 The `twitch` platform will allow you to monitor [Twitch](http://www.twitch.tv/) channel status from within Home Assistant and setup automation based on the information.
 
+## {% linkable_title Configuration %}
+
 To use Twitch with your installation, add the following to your `configuration.yaml` file:
 
 ```yaml
@@ -27,8 +29,13 @@ sensor:
     - channel2
 ```
 
-Configuration variables:
-
-- **channels** array (*Required*): Array of channels.
-  - **channel_name** (*Required*): Name of the channel.
+{% configuration %}
+channels:
+  description: List of channels.
+  required: true
+  type: map
+  keys:
+    channel_id:
+      description: Name of the channel.
+{% endconfiguration %}