Fix :param: in docstring
Fix :param: in docstring

In docstring :param should be used instead of :param:.

Change-Id: I366b5cc5c90ec654839deda4104605a0275374ef

klmitch/nova,rahulunair/nova,mahak/nova,openstack/nova,klmitch/nova,klmitch/nova,klmitch/nova,openstack/nova,rahulunair/nova,rahulunair/nova,mahak/nova,mahak/nova,openstack/nova