Merge bitcoin/bitcoin#23937: doc: Fix dumptxoutset RPC help doc

faa9e46 doc: Fix dumptxoutset RPC help doc (MarcoFalke)

Pull request description:

  Fixes `help dumptxoutset`.

  To test: `help dumptxoutset`.

ACKs for top commit:
  shaavan:
    ACK faa9e46

Tree-SHA512: f40f1636469da61ab4a2aa6d9efb84de525b220e8897b4fe2720211def87d262be57956d1474fe04f395e7634d83b4e5aee474ad869b4b5aa619f22ecd2e78fc

Author: fanquake

src/rpc/blockchain.cpp

@@ -2576,13 +2576,9 @@ static RPCHelpMan dumptxoutset()
 {
     return RPCHelpMan{
         "dumptxoutset",
-        "\nWrite the serialized UTXO set to disk.\n",
+        "Write the serialized UTXO set to disk.",
         {
-            {"path",
-                RPCArg::Type::STR,
-                RPCArg::Optional::NO,
-                /* default_val */ "",
-                "path to the output file. If relative, will be prefixed by datadir."},
+            {"path", RPCArg::Type::STR, RPCArg::Optional::NO, "Path to the output file. If relative, will be prefixed by datadir."},
         },
         RPCResult{
             RPCResult::Type::OBJ, "", "",