Feature article for IPv6 (#1820)

linkerd.io/content/2.16/features/ipv6.md

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+title = "IPv6 Support"
+description = "Linkerd is compatible with both IPv6-only and dual-stack clusters."
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+
+As of version 2.16 (and edge-24.8.2) Linkerd fully supports Kubernetes clusters
+configured for IPv6-only or dual-stack networking.
+
+This is disabled by default; to enable just set `proxy.disableIPv6=false` when
+installing the control plane and, if you use it, the linkerd-cni plugin.
+
+Enabling IPv6 support does not generally change how Linkerd operates, except in
+one way: when enabled on a dual-stack cluster, Linkerd will only use the IPv6
+endpoints of destinations and will not use the IPv4 endpoints.