docs: Fix Yii2 version notation in system requirements for clarity.

Author: terabytesoftw

docs/installation.md

@@ -4,7 +4,7 @@
 
 - [`PHP`](https://www.php.net/downloads) 8.1 or higher.
 - [`PHPStan`](https://github.com/phpstan/phpstan) 2.1 or higher.
-- [`Yii2`](https://github.com/yiisoft/yii2) 2.0.52+(dev-master) or 22.x.
+- [`Yii2`](https://github.com/yiisoft/yii2) 2.0.52+ or 22.x.
 
 ## Installation