Updated the Kafka Exporter README file to indicate supported pipeline… (

#8814)

* Updated the Kafka Exporter README file to indicate supported pipeline types

* Update CHANGELOG.md

* Update README

exporter/kafkaexporter/README.md

@@ -1,9 +1,11 @@
 # Kafka Exporter
 
-Kafka exporter exports traces to Kafka. This exporter uses a synchronous producer
+Kafka exporter exports logs, metrics, and traces to Kafka. This exporter uses a synchronous producer
 that blocks and does not batch messages, therefore it should be used with batch and queued retry
 processors for higher throughput and resiliency. Message payload encoding is configurable.
-
+
+Supported pipeline types: logs, metrics, traces
+
 The following settings are required:
 - `protocol_version` (no default): Kafka protocol version e.g. 2.0.0