Make the cheat sheet more API-oriented

[pzehner]

For now (i.e. when finalizing #19), the cheat sheet has a style which is not fully descriptive of the API, unlike the OpenMP cheat sheet or the SYCL cheat sheet.

Signatures of functions are incomplete and do not explicit input parameter types. By instance, the signature for a View is:

Kokkos::View<DataType, LayoutType, MemorySpace, MemoryTraits> view("label", numberOfElements);

while in the API doc, the signature is displayed as (without descriptive text):

template <class DataType [, class LayoutType] [, class MemorySpace] [, class MemoryTraits]>
class View;

View()

View(const View<DT, Prop...> &rhs)

View(View &&rhs)

View(const std::string &name, const IntType&... indices)

View(const std::string &name, const array_layout &layout)

View(const AllocProperties &prop, const IntType&... indices)

View(const AllocProperties &prop, const array_layout &layout)

View(pointer_type ptr, const IntType&... indices)

View(pointer_type ptr, const array_layout &layout)

View(const ScratchSpace &space, const IntType&... indices)

View(const ScratchSpace &space, const array_layout &layout)

View(const View<DT, Prop...> &rhs, Args... args)

Obviously, not all signatures should be in the cheat sheet, but we could include the most common ones. The types of the input parameters are explicited, which would be an improvement.