Merge #21285: wallet: fix doc typo in signer option

da30c1b wallet: fix doc typo in signer option (William Casarin)

Pull request description:

ACKs for top commit:
  0xB10C:
    ACK da30c1b
  darosior:
    ACK da30c1b

Tree-SHA512: 1f4ba501121101bbe94a18a0276df6a3592123548110ed5d1e4e1937b75c9a832bc3f0d6fa26bab69b3304526ef0548b2540d446e05a6402793321a34f508b09

Author: fanquake

src/wallet/init.cpp

@@ -62,7 +62,7 @@ void WalletInit::AddWalletOptions(ArgsManager& argsman) const
                                                             CURRENCY_UNIT, FormatMoney(CFeeRate{DEFAULT_PAY_TX_FEE}.GetFeePerK())), 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("-txconfirmtarget=<n>", strprintf("If paytxfee is not set, include enough fee so transactions begin confirmation on average within n blocks (default: %u)", DEFAULT_TX_CONFIRM_TARGET), ArgsManager::ALLOW_ANY, OptionsCategory::WALLET);