[Wallet][RPC] add missing abandon status documentation

src/wallet/rpcwallet.cpp

@@ -1439,6 +1439,7 @@ UniValue listtransactions(const UniValue& params, bool fHelp)
             "    \"vout\": n,                (numeric) the vout value\n"
             "    \"fee\": x.xxx,             (numeric) The amount of the fee in " + CURRENCY_UNIT + ". This is negative and only available for the \n"
             "                                         'send' category of transactions.\n"
+            "    \"abandoned\": xxx          (bool) 'true' if the transaction has been abandoned (inputs are respendable).\n"
             "    \"confirmations\": n,       (numeric) The number of confirmations for the transaction. Available for 'send' and \n"
             "                                         'receive' category of transactions. Negative confirmations indicate the\n"
             "                                         transaction conflicts with the block chain\n"