Update _index.md

[mhlidd]

What does this PR do? What is the motivation?

Update documentation for DD_TRACE_EXPERIMENTAL_FEATURES_ENABLED to include the all keyword.

Merge instructions

Merge readiness:

• Ready for merge

For Datadog employees:
Merge queue is enabled in this repo. Your branch name MUST follow the <name>/<description> convention and include the forward slash (/). Without this format, your pull request will not pass in CI, the GitLab pipeline will not run, and you won't get a branch preview. Getting a branch preview makes it easier for us to check any issues with your PR, such as broken links.

If your branch doesn't follow this format, rename it or create a new branch and PR.

To have your PR automatically merged after it receives the required reviews, add the following PR comment:

/merge

Additional notes

[domalessi]

Minor tweak. Hit me up when you've reviewed and are ready for official sign-off!

[mhlidd]

/merge

[dd-devflow]

View all feedbacks in Devflow UI.

2025-04-24 19:00:43 UTC ℹ️ Start processing command /merge

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2025-04-24 19:00:50 UTC ℹ️ MergeQueue: waiting for PR to be ready

This merge request is not mergeable yet, because of pending checks/missing approvals. It will be added to the queue as soon as checks pass and/or get approvals.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

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2025-04-24 23:01:05 UTC ⚠️ MergeQueue: This merge request was unqueued

devflow unqueued this merge request: It did not become mergeable within the expected time

[domalessi]

@mhlidd I'm closing this PR in favor of this one: #28981

I didn't catch it earlier (sorry!) but your branch doesn't follow our conventions, so that's why the auto-merge wasn't working.