Documentation updates - September 7, 2026

Summary of documentation changes made on September 7, 2026.

User Guides

• Route Leak Prevention: New article explaining BGP roles from RFC 9234, role negotiation, and route leak prevention and detection, with configuration examples for provider/customer, route server, peering, and iBGP sessions. The BGP local.role and session remote.role entries in the CLI Reference now link to it.