Code review comment for ~mkukri/grub:ubuntu

So the changelog entry could be nicer, usually you'd want some text before the (LP: #...) saying what is fixed, it looks weird to just have the bug link there.

+ * (LP: #2043995)
+ - Remove workaround introduced by LP: 1889556
+ - Theoretically wasn't needed since /boot rollback was introduced upstream
+ - Also increase grub-install robustness by delaying the update of /boot after
+ install device validation