KVM: x86/mmu: fix comment about mmu_unsync_pages_lock

Fix the comment about what can and cannot happen when mmu_unsync_pages_lock
is not help.  The comment correctly mentions "clearing sp->unsync", but then
it talks about unsync going from 0 to 1.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20231125083400.1399197-5-pbonzini@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>