MINOR: removed unwanted line breaks (#18744)

Reviewers: Chia-Ping Tsai <[email protected]>

README.md

@@ -9,9 +9,7 @@
 [![CI](https://github.com/apache/kafka/actions/workflows/ci.yml/badge.svg?branch=trunk&event=push)](https://github.com/apache/kafka/actions/workflows/ci.yml?query=event%3Apush+branch%3Atrunk)
 [![Flaky Test Report](https://github.com/apache/kafka/actions/workflows/generate-reports.yml/badge.svg?branch=trunk&event=schedule)](https://github.com/apache/kafka/actions/workflows/generate-reports.yml?query=event%3Aschedule+branch%3Atrunk)
 
-[**Apache Kafka**](https://kafka.apache.org) is an open-source distributed event streaming platform used by thousands of
-
-companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications.
+[**Apache Kafka**](https://kafka.apache.org) is an open-source distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications.
 
 You need to have [Java](http://www.oracle.com/technetwork/java/javase/downloads/index.html) installed.