message: docs: fix send command example
diff: @@ -127,9 +127,7 @@ Payload:
  {
  "nodeId": 23,
  "commandClass": 38,
  - "commandClassName": "Multilevel Switch",
  "endpoint": 0,
  - "property": "targetValue"
  },
  "startLevelChange",
  [{}] // this are the args, in this case it could be omitted
  