VIS figure 12.1 does not match API

[Dan Bonachea]

VIS figure 12.1 in the spec does not match the current strided API. This figure was cloned from GASNet strided spec, but these have diverged in minor ways sufficient to cause confusion:

1. The argument names don't match those in the declarations, or in the caption
2. The number of elements in the count array don't match UPC++ strided
3. sizeof(T) is not reflected (it's basically count[0])

[Dan Bonachea]

Fixed in 49c558e