[SYCL][DOC] Fixed-size private arrays as an input for Group Algorithms

[andreyfe1]

For performance reasons it's better to process fixed-size arrays of variables in private memory using Group Algorithms. The proposal introduces such capability.

Based on following extensions:

• Sorting algorithm
• Properties

Signed-off-by: Fedorov, Andrey [email protected]

[keryell]

It is not clear to me what you mean by static array here.

[andreyfe1]

It is not clear to me what you mean by static array here.

Sorry, I mean fixed-size arrays, e.g. std::array<T>, T[N]. Would it be better, if I replaced static arrays with fixed-sized arrays in this document?