KAFKA-18068 Document deprecation of PARTITIONER_ADPATIVE_PARTITIONING_ENABLE_CONFIG (#20322)

Document deprecation of PARTITIONER_ADPATIVE_PARTITIONING_ENABLE_CONFIG
in `upgrade.html`, which was missed in #20317

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

Author: mingyen066

docs/upgrade.html

@@ -37,6 +37,9 @@ <h5><a id="upgrade_420_notable" href="#upgrade_420_notable">Notable changes in 4
     <li>
         The support for MX4J library, enabled through <code>kafka_mx4jenable</code> system property, was deprecated and will be removed in Kafka 5.0.
     </li>
+    <li>
+        The <code>PARTITIONER_ADPATIVE_PARTITIONING_ENABLE_CONFIG</code> in <code>ProducerConfig</code> was deprecated and will be removed in Kafka 5.0. Please use the <code>PARTITIONER_ADAPTIVE_PARTITIONING_ENABLE_CONFIG</code> instead.
+    </li>
 </ul>
 
 <h4><a id="upgrade_4_1_0" href="#upgrade_4_1_0">Upgrading to 4.1.0</a></h4>