Issue #3390903 by sakthi_dev, dpi, smustgrave:...

Issue #3390903 by sakthi_dev, dpi, smustgrave: \Drupal\Core\Queue\QueueInterface::createItem is typehinted as possibly returning bool, but never returns true

(cherry picked from commit 79001a92)

core/lib/Drupal/Core/Queue/QueueInterface.php

@@ -18,7 +18,7 @@ interface QueueInterface {
    * @param $data
    *   Arbitrary data to be associated with the new task in the queue.
    *
-   * @return bool|int|string
+   * @return false|int|string
    *   A unique ID if the item was successfully created and was (best effort)
    *   added to the queue, otherwise FALSE. We don't guarantee the item was
    *   committed to disk etc, but as far as we know, the item is now in the