Address comments

Signed-off-by: Federico Valeri <fedevaleri@gmail.com>

Author: fvaleri

core/src/main/scala/kafka/utils/Mx4jLoader.scala

@@ -37,7 +37,7 @@ object Mx4jLoader extends Logging {
     val props = new VerifiableProperties(System.getProperties)
     if (!props.getBoolean("kafka_mx4jenable", default = false))
       return false
-    warn("MX4j is deprecated and will be removed in the next major release")
+    warn("MX4j is deprecated and will be removed in Kafka 5.0")
     val address = props.getString("mx4jaddress", "0.0.0.0")
     val port = props.getInt("mx4jport", 8082)
     try {

docs/upgrade.html

@@ -35,7 +35,7 @@ <h5><a id="upgrade_420_notable" href="#upgrade_420_notable">Notable changes in 4
         For further details, please refer to <a href="https://cwiki.apache.org/confluence/x/1gq9F">KIP-1157</a>.
     </li>
     <li>
-        The support for MX4J library, enabled through <code>kafka_mx4jenable</code> system property, was deprecated and will be removed in the next major release.
+        The support for MX4J library, enabled through <code>kafka_mx4jenable</code> system property, was deprecated and will be removed in Kafka 5.0.
     </li>
 </ul>