Update camera.mqtt.markdown (#8791)

source/_components/camera.mqtt.markdown

@@ -41,4 +41,33 @@ unique_id:
   description: An ID that uniquely identifies this camera. If two cameras have the same unique ID Home Assistant will raise an exception.
   required: false
   type: string
+device:
+  description: "Information about the device this camera is a part of to tie it into the [device registry](https://developers.home-assistant.io/docs/en/device_registry_index.html). Only works through [MQTT discovery](/docs/mqtt/discovery/) and when [`unique_id`](#unique_id) is set."
+  required: false
+  type: map
+  keys:
+    identifiers:
+      description: 'A list of IDs that uniquely identify the device. For example a serial number.'
+      required: false
+      type: list, string
+    connections:
+      description: 'A list of connections of the device to the outside world as a list of tuples `[connection_type, connection_identifier]`. For example the MAC address of a network interface: `"connections": ["mac", "02:5b:26:a8:dc:12"]`.'
+      required: false
+      type: list
+    manufacturer:
+      description: The manufacturer of the device.
+      required: false
+      type: string
+    model:
+      description: The model of the device.
+      required: false
+      type: string
+    name:
+      description: The name of the device.
+      required: false
+      type: string
+    sw_version:
+      description: The firmware version of the device.
+      required: false
+      type: string
 {% endconfiguration %}