Fix eNB doc not to show all eNB subsections on the same level of other sections

Change-Id: Ib862e3630cb07fa6ba5f9b5d67fbf9e0c94b3e5c
diff --git a/pronto_deployment_guide/enb_installation.rst b/pronto_deployment_guide/enb_installation.rst
index ed751c2..71a9858 100644
--- a/pronto_deployment_guide/enb_installation.rst
+++ b/pronto_deployment_guide/enb_installation.rst
@@ -2,14 +2,14 @@
    SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
    SPDX-License-Identifier: Apache-2.0
 
-.. _enb-installation:
-
+================
 eNB Installation
 ================
-
 This section describes how to install and configure the Sercomm eNB
 which is the default eNB device for Aether/Pronto project.
 
+.. _enb-installation:
+
 Preliminaries
 =============
 In order to install and configure the Sercomm eNB, we should prepare following device: