Fix the description of hypervisors.list

trivial docstring fix

http://docs.openstack.org/developer/python-novaclient
/ref/v2/hypervisors.html

Change-Id: I1b7a3eed1e809fde80dd49fd617931ca4e2fc072

novaclient/v2/hypervisors.py

@@ -58,6 +58,7 @@ class HypervisorManager(base.ManagerWithFind):
     def list(self, detailed=True, marker=None, limit=None):
         """
         Get a list of hypervisors.
+
         :param marker: Begin returning hypervisor that appear later in the
                        keypair list than that represented by this keypair name
                        (optional).