Remove FAQ_ULA as it is unused in `core`

Signed-off-by: Christian König <ckoenig@posteo.de>

advanced/Scripts/piholeDebug.sh

@@ -53,7 +53,6 @@ FAQ_HARDWARE_REQUIREMENTS="${COL_CYAN}https://docs.pi-hole.net/main/prerequisite
 FAQ_HARDWARE_REQUIREMENTS_PORTS="${COL_CYAN}https://docs.pi-hole.net/main/prerequisites/#ports${COL_NC}"
 FAQ_HARDWARE_REQUIREMENTS_FIREWALLD="${COL_CYAN}https://docs.pi-hole.net/main/prerequisites/#firewalld${COL_NC}"
 FAQ_GATEWAY="${COL_CYAN}https://discourse.pi-hole.net/t/why-is-a-default-gateway-important-for-pi-hole/3546${COL_NC}"
-FAQ_ULA="${COL_CYAN}https://discourse.pi-hole.net/t/use-ipv6-ula-addresses-for-pi-hole/2127${COL_NC}"
 FAQ_FTL_COMPATIBILITY="${COL_CYAN}https://github.com/pi-hole/FTL#compatibility-list${COL_NC}"
 FAQ_BAD_ADDRESS="${COL_CYAN}https://discourse.pi-hole.net/t/why-do-i-see-bad-address-at-in-pihole-log/3972${COL_NC}"