Improvements of the description of Disconnect Reason Code values

RC 137: accepted RC 142: The new connection already exists so the words are corrrect RC 150: Change to "The received data rate is too high". We do not actually otherwise define this RC, and thus we do not define the basis on which the receiver determines that the rate is too high. RC 159: The present perfect (is closed) is correct in this case. Although the receive of the DISCONNECT and the closing of the connection are asynchronous events, it is likely that the close is done before the DISCONNECT is received. In any case, the present perfect indicates that they are closely coincident in time. I would prefer not to renumber reason codes at this time. We have stated there is no meaning to the codes. There were mostly assigned with similar RCs together, but often that means blocks of server only RCs together.