update phpDoc

framework/yii/helpers/BaseInflector.php

@@ -444,7 +444,7 @@ class BaseInflector
 	 * [[$transliteration]] array.
 	 * @param string $string An arbitrary string to convert
 	 * @param string $replacement The replacement to use for spaces
-	 * @param bool $lowercase
+	 * @param bool $lowercase whether to return the string in lowercase or not. Defaults to `true`.
 	 * @return string The converted string.
 	 */
 	public static function slug($string, $replacement = '-', $lowercase = true)