Update Feature.php (#147)

Author: maartenpaauw

src/Feature.php

@@ -29,7 +29,7 @@
  * @method static void purge(string|array|null $features = null)
  * @method static string name(string $feature)
  * @method static array nameMap()
- * @method static void instance(void $name)
+ * @method static mixed instance(string $name)
  * @method static \Laravel\Pennant\Contracts\Driver getDriver()
  * @method static void macro(string $name, object|callable $macro)
  * @method static void mixin(object $mixin, bool $replace = true)