message: [Docs] Use mainnet port for example in masternode.conf file
  Fixes
diff: @@ -30,7 +30,7 @@ bool CMasternodeConfig::read(std::string& strErr)
  if (configFile != NULL) {
  std::string strHeader = "# Masternode config file\n"
  "# Format: alias IP:port masternodeprivkey collateral_output_txid collateral_output_index\n"
  - "# Example: mn1 127.0.0.2:51474 93HaYBVUCYjEMeeH1Y4sBGLALQZE1Yc1K64xiqgX37tGBDQL8Xg 2bcd3c84c84f87eaa86e4e56834c92927a07f9e18718810b92e0d0324456a67c 0\n";
  + "# Example: mn1 127.0.0.2:51472 93HaYBVUCYjEMeeH1Y4sBGLALQZE1Yc1K64xiqgX37tGBDQL8Xg 2bcd3c84c84f87eaa86e4e56834c92927a07f9e18718810b92e0d0324456a67c 0\n";
  fwrite(strHeader.c_str(), std::strlen(strHeader.c_str()), 1, configFile);
  fclose(configFile);
  }
  