[reorg fix] Nicolas.jung/add ai grok parser

[jhgilbert]

🤖 Auto-generated fix for #38349.

@njung009 — the docs repo reorg created merge conflicts in your PR #38349. This is an auto-generated replacement with the file paths fixed; please use it instead of the original.

This PR replays the commits from #38349 with file paths translated to the post-reorg hugo/ layout. The original commits are preserved — same messages and authorship.

The original PR (#38349) will be closed in favor of this one.

Next steps:

1. Verify that this PR looks correct in the browser.
2. Remove the WORK IN PROGRESS label from this PR.
3. Wait for the standard docs team approval before merging. Optionally, you can check the 'ready for merge' checkbox below if you would like the docs team to merge it for you.

• Ready for merge

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Original PR description:

What does this PR do? What is the motivation?

Update the Grok Parser doc in log pipelines to reflect updated Grok Parser that is rolled out/being rolled out.

Merge readiness

• Ready for merge

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AI assistance

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Modified Files

• https://docs-staging.datadoghq.com/reorg-fix/pr-38349/logs/log_configuration/processors/grok_parser