name change

Author: asergaz

articles/iot-operations/toc.yml

@@ -45,7 +45,7 @@ items:
         displayName: Kubernetes, cluster, single, multiple, node, multi, performance
     - name: Secure your deployment
       items:
-      - name: Certificate management
+      - name: Manage certificates
         href: secure-iot-ops/concept-default-root-ca.md
         displayName: TLS, X.509, certificate, root CA, self-signed, trusted CA, CA, issuer, cert-manager, trust-manager
       - name: Manage secrets