Helm-415: Docs direct user to create a Custom Action when creating a Dashboard but this feature no longer exists in Grafana v9

[Bonrob2]

Pull Request Check Sheet

• Have you read and followed our Contribution Guidelines?
• Have you made an issue in the OpenNMS issue tracker?
  If so, you should:
  1. update the title of this PR to be of the format: ${JIRA-ISSUE-NUMBER}: subject of pull request
  2. update the JIRA link at the bottom of this comment to refer to the real issue number
  3. prefix your commit messages with the issue number, if possible
• Have you made a comment in that issue which points back to this PR?
• Have you updated the JIRA link at the bottom of this comment to link to your issue?
• If this is a new feature, is there documentation?
• If this is a new feature or substantial change, are there tests that cover it?

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External References

• JIRA (Issue Tracker): http://issues.opennms.org/browse/HELM-415
• JIRA (Issue Tracker): http://issues.opennms.org/browse/HELM-416
• JIRA (Issue Tracker): http://issues.opennms.org/browse/HELM-418
• Continuous Integration: CircleCI

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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