Update comments on the move of /etc/dnsmasq.old -> /etc/dnsmasq.old t…

…o better reflect why we are doing it

Signed-off-by: Adam Warner <[email protected]>

automated install/basic-install.sh

@@ -1159,7 +1159,8 @@ remove_old_dnsmasq_ftl_configs() {
 
  # If the dnsmasq config file exists
  if [[ -f "${dnsmasq_conf}" ]]; then
- # Back it up - we will need to add a symlink to /etc/pihole/dnsmasq.conf later
+ # There should not be anything custom in here for Pi-hole users
+ # It is no longer needed, but we'll back it up instead of deleting it just in case
  mv "${dnsmasq_conf}" "${dnsmasq_conf}.old"
  fi