Trivial: Fix a typo in test_network.py

Change-Id: I5fe4865473ea885b54d02b5d174a632221f815c8

Author: Tang Chen

openstackclient/tests/network/v2/test_network.py

@@ -503,7 +503,7 @@ def test_set_nothing(self):
 
 class TestShowNetwork(TestNetwork):
 
-    # The network to set.
+    # The network to show.
     _network = network_fakes.FakeNetwork.create_one_network()
 
     columns = (