Documentation: kvm: fix dirty log ioctl arch lists

KVM_GET_DIRTY_LOG is implemented by all architectures, not just x86,
and KVM_CAP_MANUAL_DIRTY_LOG_PROTECT is additionally implemented by
arm, arm64, and mips.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>