document additional Logstash pipeline settings

[yaauie]

Summary

Reflect recently-added support for additional Logstash pipeline settings pipeline.ecs_compatibility and pipeline.ordered (depends on elastic/logstash#12861).

Checklist

Delete any items that are not applicable to this PR.

• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios
• Any UI touched in this PR is usable by keyboard only (learn more about keyboard accessibility)
• Any UI touched in this PR does not create any new axe failures (run axe in browser: FF, Chrome)
• If a plugin configuration key changed, check if it needs to be allowlisted in the cloud and added to the docker list
• This renders correctly on smaller devices using a responsive layout. (You can test this in your browser)
• This was checked for cross-browser compatibility

For maintainers

• This was checked for breaking API changes and was labeled appropriately

[elasticmachine]

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

[KOTungseth]

I changed the formatting to a bulleted list, but otherwise, LGTM.

[KOTungseth]

@elasticmachine run elasticsearch-ci/docs