Renamed variable.
Renamed variable.

The Arbitrary property on the Property attribute is an array of Type
values, just like the class-level Arbitrary attribute. This change makes
this a bit clearer.

ploeh/FsCheck,jhamm/FsCheck,fscheck/FsCheck,fsharp/FsCheck,sideeffffect/FsCheck,ErikSchierboom/FsCheck,fscheck/FsCheck