doc fix

framework/log/FileTarget.php

@@ -26,7 +26,7 @@ use yii\helpers\FileHelper;
 class FileTarget extends Target
 {
 	/**
-	 * @var string log file path or path alias. If not set, it will use the "runtime/logs/app.log" file.
+	 * @var string log file path or path alias. If not set, it will use the "@runtime/logs/app.log" file.
 	 * The directory containing the log files will be automatically created if not existing.
 	 */
 	public $logFile;