Changed docs so dim(y) = 1
Changed docs so dim(y) = 1

The library will be changed so that there can only be one y-dimension. This documentation change is to prepare for that change (which will come in a later commit)
bgrimstad/splinter,ds283/splinter,lasote/multivariate-splines,ds283/splinter,ds283/splinter,bgrimstad/splinter,ds283/splinter,bgrimstad/splinter,bgrimstad/splinter,bgrimstad/splinter,ds283/splinter