Update Ruby configuration docs

[newrelic-ruby-agent-bot]

This is an automated PR generated by the Ruby agent CI. Please delete the branch on merge.

[github-actions[bot]]

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[!NOTE]

Our Vale automated writing feedback tool has suggestions for this PR. You can view these suggestions in the Files changed tab. If you're not a New Relic docs writer, we'll review any comments and you don't need to take any action (though feel free to make edits if you like!).

[newrelic-ruby-agent-bot]

Closing to address vale linter failures