docs: fix typo in Kafka output plugin description

Change 'Kafka input plugin' to 'Kafka output plugin' in the introduction

Signed-off-by: Arbin <arbin.cheng@coins.ph>

Author: kalavt

pipeline/outputs/kafka.md

@@ -2,7 +2,7 @@
 
 The _Kafka Producer_ output plugin lets you ingest your records into an [Apache Kafka](https://kafka.apache.org/) service. This plugin uses the official [librdkafka C library](https://github.com/edenhill/librdkafka).
 
-In Fluent Bit 4.0.4 and later, the Kafka input plugin supports authentication with AWS MSK IAM, enabling integration with Amazon MSK (Managed Streaming for Apache Kafka) clusters that require IAM-based access.
+In Fluent Bit 4.0.4 and later, the Kafka output plugin supports authentication with AWS MSK IAM, enabling integration with Amazon MSK (Managed Streaming for Apache Kafka) clusters that require IAM-based access.
 
 ## Configuration parameters