KVM: docs: mmu: Fix link to NPT presentation from KVM Forum 2008

Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

Documentation/virtual/kvm/mmu.txt

@@ -465,5 +465,5 @@ Further reading
 ===============
 
 - NPT presentation from KVM Forum 2008
-  http://www.linux-kvm.org/wiki/images/c/c8/KvmForum2008%24kdf2008_21.pdf
+  http://www.linux-kvm.org/images/c/c8/KvmForum2008%24kdf2008_21.pdf