docs: improve descriptions

Co-authored-by: Zaiming (Stone) Shi <zmstone@gmail.com>

changes/ee/feat-9564.en.md

@@ -1,3 +1,2 @@
 Implemented Kafka Consumer bridge.
-Now it's possible to consume messages from Kafka and publish them to
-MQTT topics.
+Now it's possible to consume messages from Kafka and publish them to MQTT topics.

changes/ee/feat-9564.zh.md

@@ -1,2 +1,2 @@
 实现了 Kafka 消费者桥接。
-现在可以从Kafka消费消息并将其发布到 MQTT主题。
+现在可以从 Kafka 消费消息并将其发布到 MQTT 主题。