message: Add comment to document v argument
diff: @@ -30,6 +30,7 @@ contract OVM_SequencerEntrypoint {
  * calldata[00:01]: transaction type (0 == EIP 155, 2 == Eth Sign Message)
  * calldata[01:33]: signature "r" parameter
  * calldata[33:65]: signature "s" parameter
  + * calldata[65:66]: signature "v" parameter
  * calldata[66:69]: transaction gas limit
  * calldata[69:72]: transaction gas price
  * calldata[72:75]: transaction nonce
  