Update librephotos.env

added comment about removing 'db' container if using your own db server.

librephotos.env

@@ -31,7 +31,7 @@ userPass=admin
 # Email for the administrative user.
 adminEmail=admin@example.com
 
-# Database host. Only change this if you want to use your own existing Postgres server.
+# Database host. Only change this if you want to use your own existing Postgres server. If using your own server, you can remove the 'db' container from docker-compose.yml
 dbHost=db
 
 # Secret Key. Get one here https://rb.gy/emgmwo (Shortened random.org link)