Update pnf and 5g use case doc

Signed-off-by: Yang Xu <yang.xu@futurewei.com>
Issue-ID: INT-1104
Change-Id: I9fa7e1babd7b7cdbdfbec71600ebed6c81ba450b
diff --git a/docs/docs_usecases.rst b/docs/docs_usecases.rst
index f233302..7eff6f4 100644
--- a/docs/docs_usecases.rst
+++ b/docs/docs_usecases.rst
@@ -40,16 +40,16 @@
 ~~~~~~~~~~~~~~~~~~~~~~~
 :ref:`5G - Real Time PM and High Volume Stream Data Collection <docs_realtime_pm>`
 
-:ref:`5G - PNF Plug and Play <docs_5g_pnf_pnp>`
-
 :ref:`5G - Bulk PM <docs_5g_bulk_pm>`
 
 :ref:`5G - Configuration over NETCONF <docs_5G_Configuration_over_NETCONF>`
 
-:ref:`5G - PNF Software Upgrade <docs_5g_pnf_software_upgrade>`
-
 :ref:`5G - OOF and PCI <docs_5G_oof_pci>`
 
+:ref:`PNF Support - PNF Plug and Play <docs_5g_pnf_pnp>`
+
+:ref:`PNF Support - PNF Software Upgrade <docs_5g_pnf_software_upgrade>`
+
 :ref:`Change Management Flexible Designer and Orchestrator <docs_CM_flexible_designer_orchestrator>`
 
 :ref:`Change Management Schedule Optimization <docs_CM_schedule_optimizer>`