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KAFKA-18908 Document that the size of appended value can't be larger than Short.MAX_VALUE (#19067) 

JIRA: KAFKA-18908
`ZooKeeper` mode allows large configuration values to be created through
an append operation. `KRaft` mode restricts configuration values to a
maximum size of `Short.MAX_VALUE`.
We should document this behavioral change.

Reviewers: Ken Huang <s7133700@gmail.com>, Chia-Ping Tsai <chia7712@gmail.com>
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@ -232,6 +232,16 @@
</ul>
</li>
</ul>
<h2 class="anchor-heading">Behavioral Change Reference</h2>
<p>
This document catalogs the functional and operational differences between ZooKeeper mode and KRaft mode.
</p>
<ul>
<li>
<strong>Configuration Value Size Limitation</strong>: KRaft mode restricts configuration values to a maximum size of <code>Short.MAX_VALUE</code>,
which prevents using the append operation to create larger configuration values.
</li>
</ul>
</div>
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