fix: PHPStan return type of RichText (#54)

Author: silasjoisten

src/Domain/Type/RichText.php

@@ -47,7 +47,7 @@ public function __construct(array $values)
 
     /**
      * @return array{
-     *     type: string,
+     *     type: 'doc',
      *     content: list<mixed[]>,
      * }
      */