Fix a copy-pasta in a comment

Change-Id: I102eb10adbe42618ba7bf361b47de7c4ad38bb17
diff --git a/tests/unit/test_v3.py b/tests/unit/test_v3.py
index 892f7f2..4f6bbdd 100755
--- a/tests/unit/test_v3.py
+++ b/tests/unit/test_v3.py
@@ -2929,9 +2929,9 @@
         ])
 
     def test_nodeset_branch_duplicate(self):
-        # Test that we can create a duplicate secret on a different
+        # Test that we can create a duplicate nodeset on a different
         # branch of the same project -- i.e., that when we branch
-        # master to stable on a project with a secret, nothing
+        # master to stable on a project with a nodeset, nothing
         # changes.
         self.create_branch('org/project1', 'stable')
         self.fake_gerrit.addEvent(