[vtkusers] Interactors documentation.

[Mark Foskey]

The documentation for vtkInteractorStyleTrackball{Camera,Actor} says 
"The position of the mouse relative to the center of the object 
determine's the speed at which the object moves."  This is the rule for 
Joystick, not Trackball.  Also, there should be no apostrophe in 
"determines".

-- 
Mark Foskey    (919) 843-5436  Computer-Aided Diagnosis and Display Lab
mark_foskey at unc.edu            Department of Radiology, CB 7515, UNC
http://www.cs.unc.edu/~foskey  Chapel Hill, NC  27599-7515