Complete upstream docs review of the P1 Security guides as identified in https://docs.google.com/spreadsheets/d/1RfFhagrnq_oyqMJNnTFQSsRwpa3HW6mwMxi1IXoztbE/edit#gid=0 

This upstream review includes the following scope:

1. Check the upstream source on main.
   • Run Vale and other helpful content quality checkers. 
   • Fix red errors and orange serious warnings only or legal-risk issues
   • Complete style and language checks. Ensure content is polished and ready for RHBQ publication (process for downstream publication tbc).
   • The review does not include restructuring. If a guide needs restructuring, raise a GitHub issue.
2. Send for peer review by another writer - Peer reviewer to focus on critical issues only like typos or serious quality issues.
3. Send for SME review to Sergey. Sergey to merge once review complete and approvals received.

This Epic is done when the Security guides listed as P1 are reviewed upstream and upstream PRs are merged on Main.