MQTT vacuum config to integration key (#22838)

source/_integrations/vacuum.mqtt.markdown

@@ -21,10 +21,30 @@ To add your MQTT vacuum to your installation, add the following to your `configu
 
 ```yaml
 # Example configuration.yaml entry
+mqtt:
+  vacuum:
+    - command_topic: "vacuum/command"
+```
+
+<a id='new_format'></a>
+
+{% details "Previous configuration format" %}
+
+The configuration format of manual configured MQTT items has changed.
+The old format that places configurations under the `vacuum` platform key
+should no longer be used and is deprecated.
+
+The above example shows the new and modern way,
+this is the previous/old example:
+
+```yaml
 vacuum:
   - platform: mqtt
+    command_topic: "vacuum/command"
 ```
 
+{% enddetails %}
+
 ## Legacy Configuration
 
 Legacy MQTT vacuum configuration section.
@@ -243,9 +263,9 @@ unique_id:
 
 ```yaml
 # Example configuration.yaml entry
+mqtt:
   vacuum:
-  - platform: mqtt
-    name: "MQTT Vacuum"
+    - name: "MQTT Vacuum"
       supported_features:
         - turn_on
         - turn_off
@@ -512,9 +532,9 @@ unique_id:
 
 ```yaml
 # Example configuration.yaml entry
+mqtt:
   vacuum:
-  - platform: mqtt
-    name: "MQTT Vacuum"
+    - name: "MQTT Vacuum"
       schema: state
       supported_features:
         - start