fixed another reference

framework/helpers/BaseHtml.php

@@ -338,7 +338,7 @@ class BaseHtml
 
 	/**
 	 * Generates an image tag.
-	 * @param string $src the image URL. This parameter will be processed by [[url()]].
+	 * @param string $src the image URL. This parameter will be processed by [[yii\helpers\Url::to()]].
 	 * @param array $options the tag options in terms of name-value pairs. These will be rendered as
 	 * the attributes of the resulting tag. The values will be HTML-encoded using [[encode()]].
 	 * If a value is null, the corresponding attribute will not be rendered.