update config.php-dist

config.php-dist

@@ -1,4 +1,21 @@
 <?php
+	/*
+		This file can be used to customize global defaults if environment method is not available (i.e. no Docker).
+
+		Use the following syntax to override defaults (options are declared in classes/config.php, prefixed by TTRSS_):
+
+		putenv('TTRSS_DB_HOST=myserver')
+		putenv('TTRSS_SELF_URL_PATH=http://example.com/tt-rss')
+
+		Plugin-required constants also go here, using define():
+
+		define('LEGACY_CONSTANT', 'value');
+
+		etc.
+
+		See this page for more information: https://tt-rss.org/wiki/GlobalConfig
+	*/
+
 	// *******************************************
 	// *** Database configuration (important!) ***
 	// *******************************************