Fix issue detected by PHPStan

src/Service/Comment/Extractor.php

@@ -72,7 +72,7 @@ private function registerPart(string $line, CommentParts $parts): CommentPart
      */
     private function splitLines(string $comment): array
     {
-        /** @var string[] $lines */
+        /** @var list<string> $lines */
         $lines = preg_split("/([\r\n]+)/", $comment, -1, \PREG_SPLIT_DELIM_CAPTURE);
         $count = \count($lines);
         $currentLineIndex = 0;