x86/sev/docs: Update document URL in amd-memory-encryption.rst

The previous link to AMD programmer's manual is no longer available,
replace it with the new one.
Signed-off-by: Jianlin Li <ljianlin99@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230922082547.522689-1-ljianlin99@gmail.com

Documentation/arch/x86/amd-memory-encryption.rst

@@ -130,4 +130,4 @@ SNP feature support.
 
 More details in AMD64 APM[1] Vol 2: 15.34.10 SEV_STATUS MSR
 
-[1] https://www.amd.com/system/files/TechDocs/40332.pdf
+[1] https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24593.pdf