Update how-new-relic-distributed-tracing-works.mdx to add info about limits now visible in the limits UI.

[beatface]

Adding info about limits that are now visible in the Limits UI.

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in your commit messages and pull request title.

Give us some context

• What problems does this PR solve?
  Tracing team is making some of our limits visible (but not editable) in the Limits UI, so adding info about that here.

• Add any context that will help us review your changes such as testing notes,
  links to related docs, screenshots, etc.

• If your issue relates to an existing GitHub issue, please link to it.

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[github-actions]

Hi @beatface 👋

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[nbaenam]

Hi @beatface, could you please sign the CLA by clicking the yellow button a few messages above this one? I'll be able to merge in as soon as you do. Thanks!

[nbaenam]

Hi @beatface, thank you for the update! I've added some TW edits