[DOCS] New Rule fields: Related Integrations, Required Fields and Setup feature information is not available

Description
New Rule fields: Related Integrations, Required Fields and Setup feature information is not available

URL

• https://www.elastic.co/guide/en/security/8.3/whats-new.html

Ticket Link:
[DOCS] Update documentation to include the new Rule fields: Related Integrations, Required Fields and Setup

[joepeeples]

These new fields have been held back from the 8.3.0 release due to dependencies on content from another team.

I think we can close this bug ticket for now, since the new fields are still in our backlog/roadmap (issue and draft PR are still open), just not ready to be documented quite yet.