[Config] Add hint about http bindings

generate_config.sh

@@ -122,6 +122,8 @@ DBROOT=$(LC_ALL=C </dev/urandom tr -dc A-Za-z0-9 | head -c 28)
 # ------------------------------
 
 # You should use HTTPS, but in case of SSL offloaded reverse proxies:
+# Might be important: This will also change the binding within the container.
+# If you use a proxy within Docker, point it to the ports you set below.
 
 HTTP_PORT=80
 HTTP_BIND=0.0.0.0