message: Remove StepRange from Device List message example
diff: @@ -244,7 +244,7 @@ sequenceDiagram
  "DeviceDisplayName": "User set name",
  "DeviceMessages": {
  "LinearCmd": [ {
  - "StepRange": [0, 100],
  + "StepCount": 100,
  "FeatureDescriptor": "Stroker"
  } ],
  "StopDeviceCmd": {}
  