User Guide corrections for MongoDB connector

In Q3 2020 the content of chapter 3.6 Deploying Debezium PostgreSQL connectors of the User Guide was updated based on observations recorded by Ramesh. PostgreSQL, as described in DBZ-2621. Many of the corrections that were made for the PostgreSQL doc also apply to the MongoDB connector.
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• Consolidate subsections 4.5.1 - 4.5.2 into a single procedure.
• Move the Monitoring subsection into its own chapter.

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4.5.1

• The configuration example incorrectly refers to kind: KafkaConnector.
  It should be kind: KafkaConnect

• Add the following annotation to the Kafka Connect resource yaml:

apiVersion: kafka.strimzi.io/v1beta1
kind: KafkaConnect
metadata:  
annotations:    
  strimzi.io/use-connector-resources: 'true'

it is defined in this blog
https://strimzi.io/blog/2020/01/27/deploying-debezium-with-kafkaconnector-resource/

Add a table to present the callout definitions from the YAML example. Currently the callouts are rendered with repeated numbers:

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4.5.2

Step 2.ii and 2.iii
Provide alternate docker commands alongside current podman build and push commands.

Step 5.i

oc logs $(oc get pods -o name -l strimzi.io/name=my-connect-cluster-connect)

should be

oc logs $(oc get pods -o name -l strimzi.io/cluster=my-connect-cluster)
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The sample yaml file has

 apiVersion: kafka.strimzi.io/v1beta1

It should be

apiVersion: kafka.strimzi.io/v1alpha1 

Not applicable. Streams 1.6 is based on Strimzi 0.20.1, for which v1beta1 is correct

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