chia7712 commented on code in PR #18751:
URL: https://github.com/apache/kafka/pull/18751#discussion_r1935839944


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docs/upgrade.html:
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@@ -85,6 +85,8 @@ <h5><a id="upgrade_400_notable" 
href="#upgrade_400_notable">Notable changes in 4
                         <li>The default properties files for KRaft mode are no 
longer stored in the separate <code>config/kraft</code> directory since 
Zookeeper has been removed. These files have been consolidated with other 
configuration files.
                             Now all configuration files are in 
<code>config</code> directory.
                         </li>
+                        <li>The validation of <code>--bootstrap-server</code> 
has become stricter. Providing space-separated bootstrap servers (e.g., 
"broker1:9092 broker2:9092 broker3:9092") instead of comma-separated (e.g., 
"broker1:9092,broker2:9092,broker3:9092") will result in an exception.

Review Comment:
   Could we highlight that "only" comma is valid? 



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