Use "replaceable" instead of "optIntoRbf" in fundrawtransaction.

To be consistent with other RPCs

src/wallet/rpcwallet.cpp

@@ -2655,7 +2655,8 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
                             "                              Those recipients will receive less bitcoins than you enter in their corresponding amount field.\n"
                             "                              If no outputs are specified here, the sender pays the fee.\n"
                             "                                  [vout_index,...]\n"
-                            "     \"optIntoRbf\"             (boolean, optional) Allow this transaction to be replaced by a transaction with higher fees\n"
+                            "     \"replaceable\"            (boolean, optional) Marks this transaction as BIP125 replaceable.\n"
+                            "                              Allows this transaction to be replaced by a transaction with higher fees\n"
                             "   }\n"
                             "                         for backward compatibility: passing in a true instead of an object will result in {\"includeWatching\":true}\n"
                             "\nResult:\n"
@@ -2707,7 +2708,7 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
                 {"reserveChangeKey", UniValueType(UniValue::VBOOL)},
                 {"feeRate", UniValueType()}, // will be checked below
                 {"subtractFeeFromOutputs", UniValueType(UniValue::VARR)},
-                {"optIntoRbf", UniValueType(UniValue::VBOOL)},
+                {"replaceable", UniValueType(UniValue::VBOOL)},
             },
             true, true);
 
@@ -2741,8 +2742,8 @@ UniValue fundrawtransaction(const JSONRPCRequest& request)
         if (options.exists("subtractFeeFromOutputs"))
             subtractFeeFromOutputs = options["subtractFeeFromOutputs"].get_array();
 
-        if (options.exists("optIntoRbf")) {
-            coinControl.signalRbf = options["optIntoRbf"].get_bool();
+        if (options.exists("replaceable")) {
+            coinControl.signalRbf = options["replaceable"].get_bool();
         }
       }
     }