improve docblocks around group sequences

Author: xabbuh

Extension/Validator/Constraints/FormValidator.php

@@ -211,7 +211,7 @@ private static function allowDataWalking(FormInterface $form)
     /**
      * Returns the validation groups of the given form.
      *
-     * @return array The validation groups
+     * @return string|GroupSequence|(string|GroupSequence)[] The validation groups
      */
     private static function getValidationGroups(FormInterface $form)
     {
@@ -246,10 +246,10 @@ private static function getValidationGroups(FormInterface $form)
     /**
      * Post-processes the validation groups option for a given form.
      *
-     * @param array|callable $groups The validation groups
-     * @param FormInterface  $form   The validated form
+     * @param string|GroupSequence|(string|GroupSequence)[]|callable $groups The validation groups
+     * @param FormInterface                                          $form   The validated form
      *
-     * @return array The validation groups
+     * @return (string|GroupSequence)[] The validation groups
      */
     private static function resolveValidationGroups($groups, FormInterface $form)
     {