firewall bouncer: document iptables_add_rule_comments

Author: blotus

crowdsec-docs/unversioned/bouncers/firewall.mdx

@@ -479,6 +479,11 @@ name of the ipv4 set
 
 name of the ipv6 set
 
+### `iptables_add_rule_comments`
+> `true` | `false`
+
+If set to `false`, disables adding comments to the iptables rules created by the bouncer. Defaults to `true`.
+
 ###  `ipset_size`
 > int