add apm trace id to llmobs span intake endpoint

[jsimpher]

What does this PR do? What is the motivation?

Recently added an allowed field for our llm obs span intake api. This updates the docs to surface that field.

Merge instructions

Merge readiness:

• [x] Ready for merge

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Additional notes

[github-actions[bot]]

✅ Documentation Team Review

The documentation team has approved this pull request. Thank you for your contribution!

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/jsimpher/tli-add-apm-trace-id-to-span-intake/llm_observability/setup/api

[jsimpher]

/merge

[dd-devflow[bot]]

View all feedbacks in Devflow UI.

2025-06-23 13:47:18 UTC :information_source: Start processing command /merge

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2025-06-23 13:47:25 UTC :information_source: MergeQueue: queue is disabled

Added to the queue but the mergequeue is not enabled for now.

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2025-07-03 22:10:36 UTC :x: MergeQueue: This merge request was updated

This PR is rejected because it was updated