Documentation: ocxl.rst: Update consortium site

Point to post-merger site.

Signed-off-by: Fritz Koenig <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/userspace-api/accelerators/ocxl.rst

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 OpenCAPI is an interface between processors and accelerators. It aims
-at being low-latency and high-bandwidth. The specification is
-developed by the `OpenCAPI Consortium <http://opencapi.org/>`_.
+at being low-latency and high-bandwidth.
+
+The specification was developed by the OpenCAPI Consortium, and is now
+available from the `Compute Express Link Consortium
+<https://computeexpresslink.org/resource/opencapi-specification-archive/>`_.
 
 It allows an accelerator (which could be an FPGA, ASICs, ...) to access
 the host memory coherently, using virtual addresses. An OpenCAPI