kernel option for ounting root on cdrom

[Christoffer Pio]

It would be a good idea to have the documentation (release notes faq, etc) reflect
that the kernel option to mount a cdrom on root / is no-longer

options         ROOTDEVNAME=\"cd9660:acd0c\"  

which is the way to do it in 4.5

but from 4.8 it has changed to

options         ROOTDEVNAME=\"cd9660:acd0\"

rather than having people spend endless hours trying to figure out what went
wrong.

C