[SYCL][Doc] Linked extension process readme from dpcpp readme. #12332
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This small addition signposts interested users to instructions on adding DPC++ extensions. It was motivated by #12251 (comment)
When looking into the logic of the docs, I found there was no signposting from the initial repo readme to tell contributors how to propose their own extensions.
There have been some important third-party contributions to dpc++ and in the future it is possible such contributions could include proposing new oneapi extensions.