4.2.0 release notes cosmetics

Author: michaelklishin

release-notes/4.2.0.md

@@ -94,8 +94,7 @@ A new RabbitMQ 4.2.0+ node will use Khepri by default. If you upgrade an
 existing node or cluster, it will continue to use whatever metadata store it
 was using so far.
 
-If you did not enable Khepri yet, [it is recommended you enable
-it](https://www.rabbitmq.com/docs/metadata-store/how-to-enable-khepri):
+If you did not enable Khepri yet, [it is recommended that you enable it](https://www.rabbitmq.com/docs/metadata-store/how-to-enable-khepri):
 
 ```
 rabbitmqctl enable_feature_flag khepri_db