Add note on FTLCONF_misc_dnsmasq_lines

Signed-off-by: yubiuser <github@yubiuser.dev>

docs/docker/configuration.md

@@ -33,6 +33,8 @@ Given the below `toml` formatted example from `pihole.toml`, we can translate th
   dnssec = true
 ```
 
+Array type configs should be delimited with `;`
+
 !!! note
     All FTL settings that are set via environment variables effectively become read-only, meaning that you will not be able to change them via the web interface or CLI. This is to ensure a "single source of truth" on the config. If you later unset or remove an environment variable, then FTL will revert to the default value for that setting
 

docs/docker/upgrading/v5-v6.md

@@ -58,6 +58,17 @@ You would now set:
 FTLCONF_dns_revServers: 'true,192.168.0.0/24,192.168.0.1#53,lan'
 ```
 
+### Custom dnsmasq config files
+
+Pi-hole v6 does not use `/etc/dnsmasq.d/` for it's config files anymore. If custom config files should used by Pi-hole you need
+
+1) Mount the local folder containing the config files into `/etc/dnsmasq.d` into the container
+2) Set the environment variable `FTLCONF_misc_etc_dnsmasq_d: 'true'`
+
+
+If you only want to add a single/few `dnsmasq` config lines you can use the variable `FTLCONF_misc_dnsmasq_lines`. Each line should be separated with `;`
+
+
 ### Removed Variables
 
 The following variables can be removed without replacement, as they are no longer used: