Remove mlr-docs codeowner for OAS

[lcawl]

Summary

Relates to #137240

This PR removes the mandatory review by @elastic/mlr-docs for open API specifications that are now actively updated by the appropriate dev teams.

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 7c7d426

Failed CI Steps

• FTR Configs #47

Test Failures

• [job] [logs] FTR Configs #47 / endpoint "before all" hook in "endpoint"

Metrics [docs]

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	411	415	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	15	17	+2
securitySolution	490	494	+4
total			+6

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[elasticmachine]

Pinging @elastic/kibana-docs (Team:Docs)

[szabosteve]

LGTM, thanks!