MC-40558: Stabilize Static tests and MHI

Author: svera

lib/internal/Magento/Framework/DB/Sql/UnionExpression.php

@@ -8,7 +8,7 @@
 use Magento\Framework\DB\Select;
 
 /**
- * @package Magento\Framework\DB\Sql
+ * Class UnionExpression handles the build of union clauses in database queries
  */
 class UnionExpression extends Expression
 {

lib/internal/Magento/Framework/MessageQueue/BatchConsumer.php

@@ -10,6 +10,8 @@
 use Magento\Framework\MessageQueue\Consumer\ConfigInterface as ConsumerConfig;
 
 /**
+ * BatchConsumer is a consumer class which implements the consumer interface
+ *
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
 class BatchConsumer implements ConsumerInterface