message: Mention -signet in bitcoin-wallet help output
diff: @@ -63,7 +63,7 @@ static bool WalletAppInit(ArgsManager& args, int argc, char* argv[])
  strUsage += "\n"
  "bitcoin-wallet is an offline tool for creating and interacting with " PACKAGE_NAME " wallet files.\n"
  "By default bitcoin-wallet will act on wallets in the default mainnet wallet directory in the datadir.\n"
  - "To change the target wallet, use the -datadir, -wallet and -testnet/-regtest arguments.\n\n"
  + "To change the target wallet, use the -datadir, -wallet and -regtest/-signet/-testnet arguments.\n\n"
  "Usage:\n"
  " bitcoin-wallet [options] <command>\n";
  strUsage += "\n" + args.GetHelpMessage();
  