Add newline to conform to docblock standards

Author: zack6849

app/code/Magento/Sales/Api/Data/OrderInterface.php

@@ -582,6 +582,7 @@ public function getAdjustmentPositive();
      * Gets the applied rule IDs for the order.
      *
      * Rules are comma separated if there are more than one.
+     *
      * @return string|null Applied rule IDs.
      */
     public function getAppliedRuleIds();

app/code/Magento/Sales/Api/Data/OrderItemInterface.php

@@ -416,6 +416,7 @@ public function getAmountRefunded();
      * Gets the applied rule IDs for the order item.
      *
      * Rules are comma separated if there are more than one.
+     *
      * @return string|null Applied rule IDs.
      */
     public function getAppliedRuleIds();

app/code/Magento/Sales/Model/Order.php

@@ -2114,6 +2114,7 @@ public function getAdjustmentPositive()
      * Returns applied_rule_ids
      *
      * Rules are comma separated if there are more than one.
+     *
      * @return string|null
      */
     public function getAppliedRuleIds()

app/code/Magento/Sales/Model/Order/Item.php

@@ -726,6 +726,7 @@ public function getAmountRefunded()
      * Returns applied_rule_ids
      *
      * Rules are comma separated if there are more than one.
+     *
      * @return string|null
      */
     public function getAppliedRuleIds()