[Website]: Specify the target cluster_uuid (optional) step

[lucabelluccini]

Before you submit

• This issue is about a documentation page, flow, or piece of content.

Type of issue

Inaccurate

What documentation page or section is affected

https://www.elastic.co/docs/reference/logstash/monitoring-with-elastic-agent

What happened?

We should clarify when using the monitoring.cluster_uuid is optional.

If Logstash writes to more than 1 ES cluster, then Logstash cannot "guess" what is the Cluster UUID and it's mandatory to explicitly set the monitoring.cluster_uuid.

Additional info

To be reviewed by @consulthys / @robbavey

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