[BUG] The screenshot should be updated to showcase the new features available for the AI Assistant chats

[muskangulati-qasource]

Documentation links

https://www.elastic.co/docs/solutions/security/ai/ai-assistant-knowledge-base#knowledge-base-rbac

Description

Actual Screenshot

Expected Screenshot

Which documentation set(s) does this bug apply to?

ESS only

Release version

This bug applies to Elastic Stack 8.18.0 and above releases

Testing environment

Build deployed from the production cloud environment: https://cloud.elastic.co/

[muskangulati-qasource]

@arvindersingh-qasource please review!

[arvindersingh-qasource]

Reviewed and assigned to @jmikell821 !