[security][8.19] Collect DNS events from Linux machines using Defend

[benironside]

Description

We're going to make Defend collect DNS event data from Linux machines, this my require a minor docs update.

More info here: https://github.com/elastic/security-team/issues/9351

Resources

More details here: https://github.com/elastic/security-team/issues/9351

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

What release is this request related to?

8.18

Collaboration model

The documentation team

Point of contact.

Main contact: @nick-alayil

Stakeholders:

[nick-alayil]

The team was fully focused on this capability for 8.18, but due to various stability concerns, we decided to postpone the changes to 8.19.

[bmorelli25]

Removing assignment until this is ready for a writer to work on.