[Internal]: Update agentless integrations FAQ

[benironside]

Description

Per https://elastic.slack.com/archives/C088JBV4TQU/p1761144639704349, there are a couple of outdated items in the agentless integrations FAQ.

Resources

Which documentation set does this change impact?

Elastic On-Prem and Cloud (all)

Feature differences

What release is this request related to?

N/A

Serverless release

Collaboration model

The documentation team

Point of contact.

Main contact: @

Stakeholders:

[benironside]

duplicate of #3602