Origin for each line in nextboot.init from check-in 5062c9b6fc:

5062c9b6fc 2019-10-19        arcade: # vim:ft=make:
5062c9b6fc 2019-10-19        arcade: 
5062c9b6fc 2019-10-19        arcade: nextboot: mount
5062c9b6fc 2019-10-19        arcade: .if exists(/boot/nextkernel)
5062c9b6fc 2019-10-19        arcade: 	: Removing nextboot setting.
5062c9b6fc 2019-10-19        arcade: 	rm -f /boot/nextkernel
5062c9b6fc 2019-10-19        arcade: .endif