KVM: x86/mmu: Fix comment typo

Fix a small comment typo in make_spte().

Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Link: https://lore.kernel.org/r/20230322013731.102955-6-minipli@grsecurity.net


Signed-off-by: Sean Christopherson <seanjc@google.com>