modify notes in the FakeHypervisorStats docstring

The arugments should be: count and current_workload

Change-Id: I445d1d72d1f1b86a626bb4c9512cdb8311b2ebc9

openstackclient/tests/compute/v2/fakes.py

@@ -393,7 +393,7 @@ class FakeHypervisorStats(object):
         :param Dictionary attrs:
             A dictionary with all attributes
         :return:
-            A FakeResource object, with id, hypervisor_hostname, and so on
+            A FakeResource object, with count, current_workload, and so on
         """
         attrs = attrs or {}