Update fleet-settings-output-kafka.asciidoc

The Kafka output is supported with Elastic Agents using the Elastic defend integration.   Tip needs to be removed.

See references 
- elastic/kibana#177717
- elastic/security-docs#4379 (comment)

Author: predogma

docs/en/ingest-management/fleet/fleet-settings-output-kafka.asciidoc

@@ -7,8 +7,6 @@ Specify these settings to send data over a secure connection to Kafka. In the {f
 
 preview::[]
 
-TIP: Kafka output is currently not supported on {agents} using the {elastic-defend} integration.
-
 [discrete]
 == General settings
 
@@ -571,4 +569,4 @@ include::../elastic-agent/configuration/outputs/output-shared-settings.asciidoc[
 
 |===
 
-:type!:
+:type!: