Add tooltip for containerd

Author: Affan-7

content/en/docs/tutorials/kubernetes-basics/create-cluster/cluster-intro.html

@@ -74,7 +74,7 @@ <h2 style="color: #3771e3;">Cluster Diagram</h2>
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                 <p><b>The Control Plane is responsible for managing the cluster.</b> The Control Plane coordinates all activities in your cluster, such as scheduling applications, maintaining applications' desired state, scaling applications, and rolling out new updates.</p>
-                <p><b>A node is a VM or a physical computer that serves as a worker machine in a Kubernetes cluster.</b> Each node has a Kubelet, which is an agent for managing the node and communicating with the Kubernetes control plane. The node should also have tools for handling container operations, such as containerd or Docker. A Kubernetes cluster that handles production traffic should have a minimum of three nodes because if one node goes down, both an <a href="/docs/concepts/overview/components/#etcd">etcd</a> member and a control plane instance are lost, and redundancy is compromised. You can mitigate this risk by adding more control plane nodes.</p>
+                <p><b>A node is a VM or a physical computer that serves as a worker machine in a Kubernetes cluster.</b> Each node has a Kubelet, which is an agent for managing the node and communicating with the Kubernetes control plane. The node should also have tools for handling container operations, such as <a class="glossary-tooltip" title="A container runtime with an emphasis on simplicity, robustness and portability." href="/docs/reference/glossary/?all=true#term-containerd">containerd</a> or Docker. A Kubernetes cluster that handles production traffic should have a minimum of three nodes because if one node goes down, both an <a href="/docs/concepts/overview/components/#etcd">etcd</a> member and a control plane instance are lost, and redundancy is compromised. You can mitigate this risk by adding more control plane nodes.</p>
 
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