[ML] Script to generate a content page for the ML Kibana API

[darnautov]

Summary

• Adds a script to generate a content page with ML Kibana API groups
• Updates the apiDocs npm command

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[szabosteve]

LGTM!

[darnautov]

@elasticmachine merge upstream

[peteharverson]

Tested and generated ml_kibana_api.mdx LGTM

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 54007f7

Failed CI Steps

• x-pack/test/fleet_api_integration/config.ts

Metrics [docs]

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
ml	555	556	+1
securitySolution	433	436	+3
total			+4

Total ESLint disabled count

id	before	after	diff
ml	558	559	+1
securitySolution	513	516	+3
total			+4

History

• 💚 Build #118258 succeeded d522fa2

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

cc @darnautov