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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[github-actions[bot]]

[!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!).

[github-actions[bot]]

[!WARNING] ruby-agent-configuration.mdx is an autogenerated file.

To change the Ruby agent configuration file, please submit an issue or open a PR in the newrelic/newrelic-ruby-agent repo.

[github-actions[bot]]

[!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!).