remove rkt reference

Author: hiramf

content/en/docs/tutorials/kubernetes-basics/explore/explore-intro.html

@@ -29,7 +29,7 @@ <h3>Objectives</h3>
 
             <div class="col-md-8">
                 <h2>Kubernetes Pods</h2>
-                <p>When you created a Deployment in Module <a href="/docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/">2</a>, Kubernetes created a <b>Pod</b> to host your application instance. A Pod is a Kubernetes abstraction that represents a group of one or more application containers (such as Docker or rkt), and some shared resources for those containers. Those resources include:</p>
+                <p>When you created a Deployment in Module <a href="/docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/">2</a>, Kubernetes created a <b>Pod</b> to host your application instance. A Pod is a Kubernetes abstraction that represents a group of one or more application containers (such as Docker), and some shared resources for those containers. Those resources include:</p>
                 <ul>
                     <li>Shared storage, as Volumes</li>
                     <li>Networking, as a unique cluster IP address</li>
@@ -51,7 +51,7 @@ <h3>Summary:</h3>
                 </div>
                 <div class="content__box content__box_fill">
                         <p><i>
-                            A Pod is a group of one or more application containers (such as Docker or rkt) and includes shared storage (volumes), IP address and information about how to run them.
+                            A Pod is a group of one or more application containers (such as Docker) and includes shared storage (volumes), IP address and information about how to run them.
                         </i></p>
                 </div>
             </div>