[update info] Add note about plex port

Updated comment about Plex advertise URL.

docker-compose/.env

@@ -27,7 +27,7 @@ PLEX_CLAIM_TOKEN=claim-xxxxxxxxxxxxxxxxxxxx
 # If you are a Plex Pass subscriber, you can enable the install of beta builds <true|false>
 PLEX_BETA_INSTALL=true
 
-# Replace http://192.168.x.x:32400 with the IP of your server/nas.
+# Replace IP in http://192.168.x.x:32400 with the IP of your server/nas, don't change the port! Unless you specifically changed the default port.
 # This is useful to aid your local clients in discovering your plex server when running in the bridge network mode.
 PLEX_ADVERTISE_URL="http://192.168.x.x:32400"