Improve formatting of blacklisted IPs

doc/security/webhooks.md

@@ -35,8 +35,8 @@ to endpoints like `http://localhost:123/some-resource/delete`.
 To prevent this type of exploitation from happening, starting with GitLab 10.6,
 all Webhook requests to the current GitLab instance server address and/or in a
 private network will be forbidden by default. That means that all requests made
-to 127.0.0.1, ::1 and 0.0.0.0, as well as IPv4 10.0.0.0/8, 172.16.0.0/12,
-192.168.0.0/16 and IPv6 site-local (ffc0::/10) addresses won't be allowed.
+to `127.0.0.1`, `::1` and `0.0.0.0`, as well as IPv4 `10.0.0.0/8`, `172.16.0.0/12`,
+`192.168.0.0/16` and IPv6 site-local (`ffc0::/10`) addresses won't be allowed.
 
 This behavior can be overridden by enabling the option *"Allow requests to the
 local network from web hooks and services"* in the *"Outbound requests"* section