Update RangePolicy constructors

[nliber]

From Release 4.3:

kokkos/kokkos#6845

While this is a breaking change, given that ChunkSize was the only thing that could be passed as Args..., it might be better not to mark this as a 4.3 specific change (it breaks a case that is unlikely to have been encountered, and adding in the previous version makes the docs more noisy for no clear benefit).

[ajpowelsnl]

@nliber - are all of the RangePolicy topics covered #523 ? If so, can this issue be closed? If not, can you summarize what else needs to be done to complete?

[ajpowelsnl]

@nliber - ping; what's left to on this guy?