message: Make can protocol arbitration ID clearer
diff: @@ -21,6 +21,17 @@ At its most basic, the CAN Simple frame looks like this:
  To understand how the Node ID and Command ID interact, let's look at an example
  +The 11-bit Arbitration ID is setup as follows:
  +
  +`can_id = axis_id << 5 | cmd_id`
  +
  +For example, an Axis ID of `0x01` with a command of `0x0C` would be result in `0x2C`:
  +
  +`0x01 << 5 | 0x0C = 0x2C`
  +
  +### Interoperability with CANopen
  +You can deconflict with CANopen like this:
  +
  `odrv0.axis0.can_node_id = 0x010` - Reserves messages 0x200 through 0x21F
  `odrv0.axis1.can_node_id = 0x018` - Reserves messages 0x300 through 0x31F
  