Issue #2819479 by shashikant_chauhan, joachim: Fully qualify the...

Issue #2819479 by shashikant_chauhan, joachim: Fully qualify the FieldItemListInterface class name in its docs so it links

core/lib/Drupal/Core/Field/FieldItemListInterface.php

@@ -22,6 +22,8 @@
  *
  * When implementing this interface which extends Traversable, make sure to list
  * IteratorAggregate or Iterator before this interface in the implements clause.
+ *
+ * @see \Drupal\Core\Field\FieldItemInterface
  */
 interface FieldItemListInterface extends ListInterface, AccessibleInterface {