Merge pull request #51981 from heoelri/patch-3

Update load-balancer-ipv6-overview.md

Author: ktoliver

articles/load-balancer/load-balancer-ipv6-overview.md

@@ -76,6 +76,7 @@ Limitations
 * Changing the loadDistributionMethod parameter for IPv6 is **currently not supported**.
 * Reserved IPv6 IPs (where IPAllocationMethod = static) are **currently not supported**.
 * NAT64 (translation of IPv6 to IPv4) is not supported.
+* Attaching a secondary NIC that refers to an IPv6 subnet to a back-end pool is **currently not supported**.
 
 ## Next steps