docker/traefik: fixed www redirection

wiki/docker/traefik.md

@@ -231,10 +231,15 @@ In both of those cases the line of the first code block in this section that spe
 and subdomain needs to include both the www and the non-www domains.
 This should look something like the following
 
+Make sure to add the domain that will be redirected to the labels aswell.
+For redirection to www domains this will look something like the following.
+
 ```yml
-  - "traefik.http.routers.<service name>-secure.rule=Host(`www.<subdomain>.<domain>`, `<subdomain>.<domain>`)"
+  - "traefik.http.routers.<service name>.rule=Host(`<subdomain>.<domain>`)"
 ```
 
+In the opposite case the domain will be `www.<subdomain>.<domain>`.
+
 ## Setup Mailserver
 
 If setting up a