Update the Service Registry section in the AMQ Streams on OCP Using Guide.

Make the following changes:

• Change intro to make it clear that there are more artifact types supported, but use examples, Avro and JSON formats.
• Describe the web console in intro and how it can be used - browsing and searching and updating
• Update URLs: Registry URLs use http://MY-REGISTRY-URL/*api*
       //eg: my-cluster-service-registry-myproject.example.com/api/artifacts.
• Add web console description (somewhere) //10.7?

• https://access.redhat.com/documentation/en-us/red_hat_integration/2020-q2/html-single/getting_started_with_service_registry/index#registry-web-console