Update ipv6-configuration.md

Author: radwiv

articles/vpn-gateway/ipv6-configuration.md

@@ -56,7 +56,8 @@ The following limitations apply to IPv6 in dual stack configuration for VPN Gate
 * IPv6 support is available for new gateway deployments using VpnGw1-5 and VpnGw1AZ-5AZ SKUs.
 * A VPN gateway deployed in IPv6 dual stack mode can't be moved to an IPv4 only configuration.
 * IPv6 can be used with IPv4 in dual stack mode to set up VPN Gateway connectivity.
-* Point-to-Site VPN gateways using IKEv2 and OpenVPN protocols support IPv6. Point-to-Site VPN gateways don't support IPv6 when using IKEv1 and SSTP protocols.
+* Point-to-Site VPN gateways using IKEv2 and OpenVPN protocols support IPv6. Point-to-Site VPN gateways don't support IPv6 when using SSTP protocol.
+* Site-to-Site VPN gateways don't support IPv6 when using IKEv1 protocol.
 * Currently IPv6 for VPN in Virtual WAN isn't supported.
 * Currently User Defined Routes (UDR) with IPv6 using a virtual network gateway VPN as the next hop aren't supported.
 * IPv6 support is available for inner traffic only. Currently, support for IPv6 in the outer VPN tunnel isn't available.