fixed short array CS in comments

Author: fabpot

Constraints/GroupSequence.php

@@ -17,7 +17,7 @@
  * When validating a group sequence, each group will only be validated if all
  * of the previous groups in the sequence succeeded. For example:
  *
- *     $validator->validate($address, null, new GroupSequence(array('Basic', 'Strict')));
+ *     $validator->validate($address, null, new GroupSequence(['Basic', 'Strict']));
  *
  * In the first step, all constraints that belong to the group "Basic" will be
  * validated. If none of the constraints fail, the validator will then validate

Context/ExecutionContextInterface.php

@@ -97,7 +97,7 @@ public function buildViolation($message, array $parameters = []);
      *     {
      *         $validator = $this->context->getValidator();
      *
-     *         $violations = $validator->validate($value, new Length(array('min' => 3)));
+     *         $violations = $validator->validate($value, new Length(['min' => 3]));
      *
      *         if (count($violations) > 0) {
      *             // ...