Update nginx one metrics

[mattdesmarais]

Proposed changes

This update clarifies that the status_zone directive is required for NGINX Plus metrics to be collected and displayed in NGINX Console. Without it, the Plus API will not populate metrics and the Agent will not send data.

The text has also been revised to align with current NGINX Console terminology — specifically, to reflect that both the Dashboard and Instances Metrics views display collected data.

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[mjang]

@mattdesmarais I think I understand what you've done. The user needs to do more to enable N+ metrics (instead of just N OSS metrics).

I've suggested changes that conform to our style guide. Specifically, we recommend the use of "active voice" (so audiences know they have to do something).