M44859: Adding breakline after title to avoid issues in live pages

Translator has reported possible source content issue. 
Description: Missing breakline is breaking format in live pages

Author: v-maudel

articles/application-gateway/ingress-controller-letsencrypt-certificate-application-gateway.md

@@ -138,9 +138,11 @@ Follow the steps below to install [cert-manager](https://docs.cert-manager.io) o
     Your browser may warn you of an invalid cert authority. The staging certificate is issued by `CN=Fake LE Intermediate X1`. This is an indication that the system worked as expected and you are ready for your production certificate.
 
 4. Production Certificate
+
     Once your staging certificate is setup successfully you can switch to a production ACME server:
     1. Replace the staging annotation on your Ingress resource with: `certmanager.k8s.io/cluster-issuer: letsencrypt-prod`
     1. Delete the existing staging `ClusterIssuer` you created in the previous step and create a new one by replacing the ACME server from the ClusterIssuer YAML above with `https://acme-v02.api.letsencrypt.org/directory`
 
 5. Certificate Expiration and Renewal
+
     Before the `Lets Encrypt` certificate expires, `cert-manager` will automatically update the certificate in the Kubernetes secret store. At that point, Application Gateway Ingress Controller will apply the updated secret referenced in the ingress resources it is using to configure the Application Gateway.