message: wallet: fix doc typo in signer option
diff: @@ -50,7 +50,7 @@ void WalletInit::AddWalletOptions(ArgsManager& argsman) const
  argsman.AddArg("-minting", "Mint proof of stake blocks", ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
  argsman.AddArg("-rescan", "Rescan the block chain for missing wallet transactions on startup", ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
  #ifdef ENABLE_EXTERNAL_SIGNER
  - argsman.AddArg("-signer=<cmd>", "External signing tool, see docs/external-signer.md", ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
  + argsman.AddArg("-signer=<cmd>", "External signing tool, see doc/external-signer.md", ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
  #endif
  argsman.AddArg("-spendzeroconfchange", strprintf("Spend unconfirmed change when sending transactions (default: %u)", DEFAULT_SPEND_ZEROCONF_CHANGE), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);
  argsman.AddArg("-wallet=<path>", "Specify wallet path to load at startup. Can be used multiple times to load multiple wallets. Path is to a directory containing wallet data and log files. If the path is not absolute, it is interpreted relative to <walletdir>. This only loads existing wallets and does not create new ones. For backwards compatibility this also accepts names of existing top-level data files in <walletdir>.", ArgsManager::ALLOW_ANY | ArgsManager::NETWORK_ONLY, OptionsCategory::WALLET);
  