update sample defines in .env-dist

.env-dist

@@ -12,9 +12,9 @@ POSTGRES_PASSWORD=password
 SELF_URL_PATH=http://localhost:8280/tt-rss
 
 # You can customize other config.php defines by setting overrides here.
-# See app/Dockerfile for complete list.
-# PLUGINS=auth_remote,note
-# CHECK_FOR_UPDATES="true"
+# See app/Dockerfile for complete list. Examples:
+# PLUGINS=auth_remote
+# SINGLE_USER_MODE=true
 
 # bind exposed port to 127.0.0.1 by default in case reverse proxy is used.
 # if you plan to run the container standalone and need origin port exposed