Specific suggested wiki "Feature Matrix" updates pertaining to SYCL.

[ghchris2021]

Specific suggested wiki "Feature Matrix" updates pertaining to SYCL (q.v. attached draft).

Modified / added footnotes 1,7, tried to make consistent with README-sycl.md and various
pertinent SYCL pull requests / issues active in recent weeks.
Some additional clarifications of which quantization / data types besides the IQ ones could
be updated by someone who has clarity about the status quo (I do not) wrt.
F16/F32/Q_n_K_x/I8/BF16/....etc.

IDK how using the GH web interface to submit a PR for the Feature-matrix.md file in the wiki section git so I thought I'd
try this since it's just a few simple changes to the one markdown file as a basis.

https://github.com/ghchris2021/tmpwiki0520/blob/a58564aa18210814fdc07dadb54018f7f612b099/Feature-matrix.md

[NeoZhangJianyu]

@ghchris2021
Here is the update as my understanding:

I-quants: SYCL- Yes.

• iq1_s is fault (big error) in one case. That won't impact to support the feature.

Multi-GPU: SYCL -Yes.

• not support [row]: in fact, it's supported as function, but with lower performance.

K cache quants: SYCL -Yes

MoE architecture: SYCL - Yes.

• There is known bug, I will fix it recently.

[ghchris2021]

@NeoZhangJianyu
Thank you very much for the information you have shared about the update, also for your
interest and work on the SYCL bug you mentioned!

I am very glad to see that there have been made the capabilities / improvements you mentioned about
SYCL support relative to what the older "Feature Matrix" listed, it seems like it is pretty well supporting
many things now.

I edited my copy of the "Feature Matrix" markdown document according to
what you have shared with me.