Move kafka dashboard changelog entry to correct place (elastic#8672)

CHANGELOG.asciidoc

@@ -88,7 +88,6 @@ https://github.com/elastic/beats/compare/v6.4.0...master[Check the HEAD diff]
 - Avoid mapping issues in kubernetes module. {pull}8487[8487]
 - Fix issue that would prevent kafka module to find a proper broker when port is not set {pull}8613[8613]
 - Fix range colors in multiple visualizations. {issue}8633[8633] {pull}8634[8634]
-- Add Kafka dashboard. {pull}8457[8457]
 
 *Packetbeat*
 
@@ -141,6 +140,7 @@ https://github.com/elastic/beats/compare/v6.4.0...master[Check the HEAD diff]
 *Heartbeat*
 
 *Metricbeat*
+
 - Add metrics about cache size to memcached module {pull}7740[7740]
 - Add `replstatus` metricset to MongoDB module {pull}7604[7604]
 - Move common kafka fields (broker, topic and partition.id) to the module level to facilitate events correlation {pull}7767[7767]
@@ -157,6 +157,7 @@ https://github.com/elastic/beats/compare/v6.4.0...master[Check the HEAD diff]
 - Add container image for docker metricsets. {issue}8214[8214] {pull}8438[8438]
 - Add support for `full` status page output for php-fpm module as a separate metricset called `process`. {pull}8394[8394]
 - Precalculate composed id fields for kafka dashboards. {pull}8504[8504]
+- Add Kafka dashboard. {pull}8457[8457]
 
 *Packetbeat*