[Internal]: CNVM doc index updates

[benironside]

Description

Update the CNVM privilege requirements page to add some new indices.

https://elastic.slack.com/archives/C07A750D3CH/p1761149580083229

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]

Turns out the docs were accurate here.