It means, if there is a 10texlive-base.cnf, and it contains # The following added lines have been transferred from # /etc\/texmf\/fmt.d\/10texlive-base-bin.cnf ...
Ok, I checked now. If the wrong lines are there a .cnfpre-edit is created and the lines commented, if the lines are not present nothing is created. I will write an email to debian-release *before* uploading if they want to accept the packages. Thanks Norbert