2.1 Fluid wagon still references straight rail segments as requirement

[INFERNO]

2.1 made fluid wagons connect to pumpjacks in far more flexible orientations. Before 2.1 it made sense to include a tip for players to use straight rails as curved rails would often not connect via pumpjack but that is no longer needed in 2.1. My sugestion, remove the string "straight" form the research and you'd still have essentially the same description without the strange enthesis on straight rails.
Thank you!