message: fix incorrect testmempoolaccept doc
diff: @@ -874,8 +874,7 @@ static RPCHelpMan testmempoolaccept()
  "\nThis checks if transactions violate the consensus or policy rules.\n"
  "\nSee sendrawtransaction call.\n",
  {
  - {"rawtxs", RPCArg::Type::ARR, RPCArg::Optional::NO, "An array of hex strings of raw transactions.\n"
  - " Length must be one for now.",
  + {"rawtxs", RPCArg::Type::ARR, RPCArg::Optional::NO, "An array of hex strings of raw transactions.",
  {
  {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""},
  },
  