Go to http://tutorials.renoise.com/wiki/Meta_Devices#.2AHydra_Device.
As is displayed in the picture, the Hydra has Input, Out 1-9 and Scaling. These are described underneath the picture. However, the ‘Out 1-9’ are called ‘Dest’. of course this is correct, since it is indeed the destination, but it might be confusing as it is not called that on the device. the other names (‘input’ and ‘scaling’) are correct, so makes sense to change this one too?
Edit: probably has to do with the XY-device description referring back to the Hydra Device description for Dest&Scaling: http://tutorials.renoise.com/wiki/Meta_Devices#.2AXY_Pad, as it IS called ‘Dest’ in the XY-device…