fix build

Author: v-krishnag

articles/iot-central/core/howto-manage-devices-with-rest-api.md

@@ -554,6 +554,8 @@ Enrollment groups are used to manage the device authentication options in your I
 
 To learn how to create and manage enrollment groups in the UI, see [How to connect devices with X.509 certificates to IoT Central Application](how-to-connect-devices-x509.md).
 
+## Add enrollment groups
+
 :::zone pivot="enrollment-group-x509"
 
 ### Generate root and device certificates
@@ -780,7 +782,6 @@ DELETE https://{your app subdomain}.azureiotcentral.com/api/enrollmentGroups/myx
 
 :::zone pivot="enrollment-group-symmetrickey"
 
-
 ### Add an symmetric key enrollment group
 
 Use the following request to create a new enrollment group with `mysymmetric` as the ID: