Adding the missing double quote in href-"Go to Certification" button

Section: CKA course

Author: divyabhushan

content/en/training/_index.html

@@ -97,7 +97,7 @@ <h5>
           </h5>
           <p>The Certified Kubernetes Administrator (CKA) program provides assurance that CKAs have the skills, knowledge, and competency to perform the responsibilities of Kubernetes administrators.</p>
           <br>
-          <a href=https://training.linuxfoundation.org/certification/certified-kubernetes-administrator-cka/" target="_blank" class="button">Go to Certification</a>
+          <a href="https://training.linuxfoundation.org/certification/certified-kubernetes-administrator-cka/" target="_blank" class="button">Go to Certification</a>
         </center>
       </div>
     </div>