fix unit test typo

tests/alerters/jira_test.py

@@ -328,8 +328,7 @@ def test_jira_arbitrary_field_support():
         mock_jira.return_value.priorities.return_value = [mock_priority]
         mock_jira.return_value.fields.return_value = mock_fields
 
-        # Cause assign_issue or add_watcher to raise, which most likely means that the user did not exist
-        #mock_jira.return_value.assign_issue.side_effect = Exception()
+        # Cause add_watcher to raise, which most likely means that the user did not exist
         mock_jira.return_value.add_watcher.side_effect = Exception()
 
         with pytest.raises(Exception) as exception: