Fix a typo in sample policy file
Fix a typo in sample policy file

In the sample policy file, HTTP method should be all uppercase,
the'PUT' was wrongly written as'Put'.

Change-Id: Ie0cec484b5f021fa3ed3c49c242be0a0d02e2e1d

mahak/neutron,openstack/neutron,mahak/neutron,mahak/neutron,openstack/neutron,openstack/neutron