fix: comment on flag for textual (#18040)

client/flags/flags.go

@@ -133,7 +133,7 @@ func AddTxFlagsToCmd(cmd *cobra.Command) {
 	f.Bool(FlagGenerateOnly, false, "Build an unsigned transaction and write it to STDOUT (when enabled, the local Keybase only accessed when providing a key name)")
 	f.Bool(FlagOffline, false, "Offline mode (does not allow any online functionality)")
 	f.BoolP(FlagSkipConfirmation, "y", false, "Skip tx broadcasting prompt confirmation")
-	f.String(FlagSignMode, "", "Choose sign mode (direct|amino-json|direct-aux), this is an advanced feature")
+	f.String(FlagSignMode, "", "Choose sign mode (direct|amino-json|direct-aux|textual), this is an advanced feature")
 	f.Uint64(FlagTimeoutHeight, 0, "Set a block timeout height to prevent the tx from being committed past a certain height")
 	f.String(FlagFeePayer, "", "Fee payer pays fees for the transaction instead of deducting from the signer")
 	f.String(FlagFeeGranter, "", "Fee granter grants fees for the transaction")