KVM: Fix comment that refers to kvm uapi header path

KVM: Fix comment that refers to kvm uapi header path

The comment that points to the path where the user-visible memslot flags
are refers to an outdated path and has a typo.

Update the comment to refer to the correct path.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Shivank Garg <shivankg@amd.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20250729225455.670324-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>