fixed markdown typo

docs/guide/url.md

@@ -70,7 +70,7 @@ return [
 ];
 ```
 
-Note that this configuration will only work if the web server has been properly configured for Yii, see (installation)[installation.md#recommended-apache-configuration].
+Note that this configuration will only work if the web server has been properly configured for Yii, see [installation](installation.md#recommended-apache-configuration).
 
 ### Named parameters