message: cli: improve -netinfo invalid argument error message
diff: @@ -379,7 +379,7 @@ public:
  if (ParseUInt8(args.at(0), &n)) {
  m_details_level = std::min(n, MAX_DETAIL_LEVEL);
  } else {
  - throw std::runtime_error(strprintf("invalid -netinfo argument: %s", args.at(0)));
  + throw std::runtime_error(strprintf("invalid -netinfo argument: %s\nFor more information, run: bitcoin-cli -netinfo help", args.at(0)));
  }
  }
  UniValue result(UniValue::VARR);
  