New 3 cohort topics are not documented

[davidradl]

Link https://odpi.github.io/egeria-docs/connectors/resource/kafka-open-metadata-topic-connector/?h=kafka+topics#omas-topics. does not refer to the 3 cohort topics only the single topic. This is important as many installations are not configured automatically create topics, and need to define them so they need to be aware of the topic names to create.

@planetf1