[Document URL]
https://docs.openshift.com/container-platform/4.6/logging/cluster-logging-external.html#cluster-logging-collector-log-forward-kafka_cluster-logging-external

[Section Number and Name]
Forwarding logs to a Kafka broker

[Describe the issue]
In the example for sending to Kafka, it's possible to read:
~~~
...
   - name: infra-logs
     type: kafka
     url: tls://kafka.devlab2.example.com:9093/infra-topic
   - name: audit-logs
...
~~~

In the infra-logs endpoint is defined to send using tls, but not secret defined

[Suggestions for improvement] 
Include in the example the secret to send via tls or use tcp to be insecure. Then, if the example is using TLS, it could be something like:

~~~
...
   - name: infra-logs
     type: kafka
     url: tls://kafka.devlab2.example.com:9093/infra-topic
     secret:
       name: kafka-secret-devlab2
   - name: audit-logs
...
~~~

Or in the case that we want to show an example for using kafka with tcp:

~~~
...
   - name: infra-logs
     type: kafka
     url: http://kafka.devlab2.example.com:9093/infra-topic
   - name: audit-logs
...
~~~

Additional information: