doc: Update VT-d spec link
Publisher of this document confirmed that VT-d spec link should be updated, and the existing link will be EOL.
@@ -104,7 +104,7 @@ Refer to the `VT-d spec`_ for more details on device-to-domain
mapping structures.
.. _VT-d spec:
- https://software.intel.com/content/www/us/en/develop/download/intel-virtualization-technology-for-directed-io-architecture-specification.html
+ https://cdrdv2.intel.com/v1/dl/getContent/671081
Address Translation Structures
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