message: Fix payment request comment
diff: @@ -12,7 +12,7 @@ package payments;
  option java_package = "org.bitcoin.protocols.payments";
  option java_outer_classname = "Protos";
  -// Generalized form of "send payment to this/these bitcoin addresses"
  +// Generalized form of "send payment to this/these qtum addresses"
  message Output {
  optional uint64 amount = 1 [default = 0]; // amount is integer-number-of-satoshis
  required bytes script = 2; // usually one of the standard Script forms
  