message: Change LinearCmd "Time" to "Duration", fix LinearCmd example
diff: @@ -206,7 +206,7 @@ In order to abstract the dynamic ranges (both speed and movement) of different t
  * _DeviceIndex_ \(unsigned int\): Index of device
  * _Vectors_ \(array\): Linear actuator speeds and positions
  * _Index_ \(unsigned int\): Index of linear actuator
  - * _Time_ \(unsigned int\): Movement time in milliseconds
  + * _Duration_ \(unsigned int\): Movement time in milliseconds
  * _Position_ \(double\): Target position with a range of \[0.0-1.0\]
  **Expected Response:**
  @@ -214,7 +214,6 @@ In order to abstract the dynamic ranges (both speed and movement) of different t
  * Ok message with matching Id on successful request.
  * Error message on value or message error.
  -
  **Serialization Example:**
  ```json
  @@ -226,12 +225,12 @@ In order to abstract the dynamic ranges (both speed and movement) of different t
  "Vectors": [
  {
  "Index": 0,
  - "Speed": 0.5,
  + "Duration": 500,
  "Position": 0.3
  },
  {
  "Index": 1,
  - "Speed": 1,
  + "Duration": 1000,
  "Posiion": 0.8
  }
  ]
  