menu: Change 'NERF Boot Menu' to 'LinuxBoot Menu'
menu: Change 'NERF Boot Menu' to 'LinuxBoot Menu'

Signed-off-by: Ryan O'Leary <ea3cd978650417470535f3a4725b6b5042a6ab59@ryanoleary.ca>

u-root/u-root,u-root/u-root,u-root/u-root