Documentation: ocxl.rst: Update consortium site

Point to post-merger site.

Signed-off-by: Fritz Koenig <frkoenig@chromium.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250312-dead_site-v2-1-920a313743ee@chromium.org

Author: Fritz Koenig

Documentation/userspace-api/accelerators/ocxl.rst

@@ -3,8 +3,11 @@ OpenCAPI (Open Coherent Accelerator Processor Interface)
 ========================================================
 
 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