note about advanced app custom aliaes

docs/guide/tutorial-advanced-app.md

@@ -74,16 +74,20 @@ Root directory contains a set of files.
 Predefined path aliases
 -----------------------
 
-- @yii - framework directory.
-- @app - base path of currently running application.
-- @common - common directory.
-- @frontend - frontend web application directory.
-- @backend - backend web application directory.
-- @console - console directory.
-- @runtime - runtime directory of currently running web application.
-- @vendor - Composer vendor directory.
-- @web - base URL of currently running web application.
-- @webroot - web root directory of currently running web application.
+- `@yii` - framework directory.
+- `@app` - base path of currently running application.
+- `@common` - common directory.
+- `@frontend` - frontend web application directory.
+- `@backend` - backend web application directory.
+- `@console` - console directory.
+- `@runtime` - runtime directory of currently running web application.
+- `@vendor` - Composer vendor directory.
+- `@web` - base URL of currently running web application.
+- `@webroot` - web root directory of currently running web application.
+
+The aliases specific to the directory structure of the advanced application
+(`@common`,  `@frontend`, `@backend`, `@console`) are defined in `common/config/aliases.php`.
+
 
 Applications
 ------------