Got a output after updating GRUB

I got this:

To use the new features provided in this GRUB update, it is recommended
   to install it to the MBR or UEFI. Due to potential configuration
   incompatibilities, it is advised to run both, installation and generation
   of configuration:
     $ grub-install ...
     $ grub-mkconfig -o /boot/grub/grub.cfg

What should I do? Is it safe to reboot?

The short answer is that the recommended action would be to run an appropriate grub-install for your install followed by grub-mkconfig -o /boot/grub/grub.cfg

The long answer is in all the responses to this topic:

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But … :nerd_face: :yum: :upside_down_face: :dizzy: nice to see a user actually reading the messages and warnings from the update terminal!