Document how to edit and delete custom metrics

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Problem to solve

Our documentation does not make it clear that custom metrics can be edited and deleted after adding them to the prometheus integration settings:

Further details

Proposal

We should update https://docs.gitlab.com/ee/user/project/integrations/prometheus.html#adding-additional-metrics-premium to include screenshots and instructions for how to edit and delete custom metrics after they have been added.

Who can address the issue

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