Fix reference in network flavor create command reference

network-flavor.rst
* The opening quote of :ref: should be a backquote
* Closing paranthesis was missing after the reference

network-service-provider.rst
* A blank line is required after a label definition

Change-Id: Ie5c2bedbb6e5b4337b69a7d1ea75c47366e3d627

Author: amotoki

doc/source/command-objects/network-flavor.rst

@@ -26,7 +26,7 @@ Create network flavor
 .. option:: --service-type <service-type>
 
     Service type to which the flavor applies to: e.g. VPN.
-    (See openstack :ref:'network_service_provider_list` (required)
+    (See openstack :ref:`network_service_provider_list`) (required)
 
 .. option:: --description <description>
 

doc/source/command-objects/network-service-provider.rst

@@ -8,6 +8,7 @@ networking service
 Network v2
 
 .. _network_service_provider_list:
+
 network service provider list
 -----------------------------