[PATCH] docs: x86: Update spec URL in x86/iommu document

[Jianlin Li]

The previous link to AMD IOMMU spec is no longer available,
replace it with the new one.

Signed-off-by: Jianlin Li <ljianlin99@xxxxxxxxx>
---
 Documentation/arch/x86/iommu.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/arch/x86/iommu.rst b/Documentation/arch/x86/iommu.rst
index 42c7a6faa39a..41fbadfe2221 100644
--- a/Documentation/arch/x86/iommu.rst
+++ b/Documentation/arch/x86/iommu.rst
@@ -5,7 +5,7 @@ x86 IOMMU Support
 The architecture specs can be obtained from the below locations.
 
 - Intel: http://www.intel.com/content/dam/www/public/us/en/documents/product-specifications/vt-directed-io-spec.pdf
-- AMD: https://www.amd.com/system/files/TechDocs/48882_IOMMU.pdf
+- AMD: https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/specifications/48882_3_07_PUB.pdf
 
 This guide gives a quick cheat sheet for some basic understanding.
 
-- 
2.25.1