[EPIC] Clean up Kafka docs

[abrennan89]

There are multiple open issues for Kafka / Strimzi docs. This epic is an attempt to group them together so that I can multitask on the docs work.

• Wrong version for strimzi-kafka-operator #4058
• There is a mistake in the installation procedure of Strimzi. #3783
• Apache Kafka Channel Example(docs/eventing/samples/kafka/channel/index.md) simplification #3078
• Apache Kafka Channel Example(docs/eventing/samples/kafka/channel/index.md) missing step to create service account #3079
• Issues with kafka channel example doc #4082
• Describe SASL option for KafkaSource #3583
• Apache Kafka Channel Example(docs/eventing/samples/kafka/channel/index.md) #3077
• Apache Kafka Source Example(docs/eventing/samples/kafka/source/index.md) Discrepancies #3081
• Application Kafka topics with KNative Trigger filtering configuration and example #2262

[devguyio]

That sounds great @abrennan89 and thanks for pinging. I would like to sync more and help.

[snneji]

@abrennan89 which issues are part of this epic?

[abrennan89]

@snneji I've already added a bunch of issues above, do you have Zenhub? Maybe otherwise you can't see them, I'm not sure?