Fix config and variable mismatches found in the audit

content/en/3.serveex/9.apps/1.adguard.md

@@ -37,7 +37,7 @@ tree:
   /:
     - srv:
       - docker:
-        - adguard:
+        - adguardhome:
           - confdir/
           - workdir/
           - compose.yaml
@@ -62,10 +62,11 @@ Name the stack `adguardhome` and paste the configuration below:
 services:
   adguardhome:
     container_name: adguard
-    image: adguard/adguardhome
+    image: adguard/adguardhome:latest
     restart: unless-stopped
     ports:
       - 53:53/udp
+      - 53:53/tcp
       - 8080:80/tcp
       - 4443:443/tcp
       - 853:853/tcp
@@ -93,6 +94,11 @@ Deploy the stack.
 
 Go to `http://yourserverip:3000` and follow the setup instructions.
 
+::warning
+
+The setup wizard asks you to pick an admin interface port. Keep it at `3000`: the SWAG configuration further down assumes the admin interface stays on that port, and changing it here would make exposing AdGuard with SWAG fail with a 502 error.
+::
+
 ### Done !
 ::