Issue #3312619: Fix various incorrect @param values for $messages

package_manager/src/ValidationResult.php

@@ -20,7 +20,7 @@ final class ValidationResult {
   /**
    * The error messages.
    *
-   * @var \Drupal\Core\StringTranslation\TranslatableMarkup[]
+   * @var \Drupal\Core\StringTranslation\TranslatableMarkup[]|string[]
    */
   protected $messages;