Merge branch '2.8' into 3.3

* 2.8:
  Docblock fixes

Author: nicolas-grekas

Constraints/AbstractComparisonValidator.php

@@ -46,7 +46,7 @@ public function validate($value, Constraint $constraint)
             if ($value instanceof \DateTimeImmutable) {
                 // If $value is immutable, convert the compared value to a
                 // DateTimeImmutable too
-                $comparedValue = new \DatetimeImmutable($comparedValue);
+                $comparedValue = new \DateTimeImmutable($comparedValue);
             } elseif ($value instanceof \DateTimeInterface) {
                 // Otherwise use DateTime
                 $comparedValue = new \DateTime($comparedValue);