Updated variable name

Author: Shikha Mishra

app/code/Magento/Downloadable/Observer/SaveDownloadableOrderItemObserver.php

@@ -132,7 +132,7 @@ public function execute(\Magento\Framework\Event\Observer $observer)
                     );
                 $linkPurchased->setLinkSectionTitle($linkSectionTitle)->save();
 
-                $linkstatus =  \Magento\Downloadable\Model\Link\Purchased\Item::LINK_STATUS_PENDING;
+                $linkStatus =  \Magento\Downloadable\Model\Link\Purchased\Item::LINK_STATUS_PENDING;
                 if ($orderStatusToEnableItem == \Magento\Sales\Model\Order\Item::STATUS_PENDING
                     || $orderItem->getOrder()->getState() == \Magento\Sales\Model\Order::STATE_COMPLETE
                 ) {