[SYCL][Doc] Remove now incorrect info from Reduction_status.md

[aelovikov-intel]

• ext::oneapi::reduction removed in [SYCL][ABI Break] Remove ext::oneapi::reduction #6634
• sycl::item in kernel supported since [SYCL] Support kernels accepting item in range reduction parallel_for #7478
• sycl::range + many reductions implemented in [SYCL][Reduction] Support range version with multiple reductions #7456
• CPU reduction performance implemented in [SYCL] Improve range reduction performance on CPU #6164
• span support implemented in [SYCL] Add reduction overloads accepting span #6019

There might be other things that have been implemented already, but I cannot immediately identify them, if any.

[Pennycook]

I couldn't find a way to comment about this line, because you didn't change it:

TODO #4 (Performance): The reductionLoop() has some order in which it choses indexes from the global index space. Currently it has huge stride to help vectorizer and get more vector insturction for the device code, which though may cause competition among devices for the memory due to pretty bad memory locality. On two-socket server CPUs using smaller stride to prioritize better memory locality gives additional perf improvement.

I think you can remove this as well, because it was fixed in #6164.

[aelovikov-intel]

@intel/llvm-gatekeepers , this PR is ready.