Update Calico add-on bullet (#18536)

* Update Calico add-on bullet

* Review update

content/en/docs/concepts/cluster-administration/addons.md

@@ -21,7 +21,7 @@ Add-ons in each section are sorted alphabetically - the ordering does not imply
 
 
 * [ACI](https://www.github.com/noironetworks/aci-containers) provides integrated container networking and network security with Cisco ACI.
-* [Calico](https://docs.projectcalico.org/latest/getting-started/kubernetes/) is a secure L3 networking and network policy provider.
+* [Calico](https://docs.projectcalico.org/latest/introduction/) is a networking and network policy provider. Calico supports a flexible set of networking options so you can choose the most efficient option for your situation, including non-overlay and overlay networks, with or without BGP. Calico uses the same engine to enforce network policy for hosts, pods, and (if using Istio & Envoy) applications at the service mesh layer.
 * [Canal](https://github.com/tigera/canal/tree/master/k8s-install) unites Flannel and Calico, providing networking and network policy.
 * [Cilium](https://github.com/cilium/cilium) is a L3 network and network policy plugin that can enforce HTTP/API/L7 policies transparently. Both routing and overlay/encapsulation mode are supported, and it can work on top of other CNI plugins.
 * [CNI-Genie](https://github.com/Huawei-PaaS/CNI-Genie) enables Kubernetes to seamlessly connect to a choice of CNI plugins, such as Calico, Canal, Flannel, Romana, or Weave.