[Cloudflare One] Add IPv6 support row to Unified Routing beta limitations (#30531)

PCX-21814

Author: steve-cloudflare

src/content/partials/networking-services/reference/traffic-steering.mdx

@@ -278,6 +278,7 @@ The following limitations apply to accounts using Unified Routing mode. This lis
 | Cloudflare Advanced Network Firewall features: IP Lists, ASN Lists, Threat Intel Lists, IDS, Rate Limiting, SIP, Managed Rulesets | Not yet supported |
 | Gateway filtering rules | Not supported on traffic where both the onramp and offramp is IPsec/GRE/CNI |
 | Load Balancer | Public-to-private use case is supported to IPsec/GRE/CNI destinations. Private-to-private use case does not yet support Cloudflare Source IPs |
+| IPv6 Support | IPv6 is supported for IPsec and GRE. Basic Network Firewall support for IPv6 is limited to src/dst IP filtering |
 
 ### Enroll in the Unified Routing beta