[Issue 5287][docs] Add documentation on how to configure multiple broker services (#5722)
[Issue 5287][docs] Add documentation on how to configure multiple broker services (#5722)

Fixes #5287 

### Motivation
Users do not know how to specify cluster (multi broker/zk) connection for presto.

### Modifications
Add content on how to configure multiple hosts for `pulsar.broker-service-url`.
yahoo/pulsar,merlimat/pulsar,yahoo/pulsar,massakam/pulsar,yahoo/pulsar,yahoo/pulsar,yahoo/pulsar,massakam/pulsar,yahoo/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,massakam/pulsar,merlimat/pulsar,merlimat/pulsar,massakam/pulsar,massakam/pulsar