Fix sample link in magnum/api/controllers/link.py
Fix sample link in magnum/api/controllers/link.py

Change-Id: I59e877369cc8d4fc6691be83b297d016d6e96036
Closes-Bug: 1471436

sajuptpm/magnum,eshijia/magnum,eshijia/SUR,Tennyson53/magnum,paulczar/magnum,paulczar/magnum,mjbrewer/testindex,mjbrewer/testindex,LaynePeng/magnum,Tennyson53/magnum,ffantast/magnum,eshijia/SUR,jay-lau/magnum,ddepaoli3/magnum,ffantast/magnum,Alzon/SUR,eshijia/magnum,Tennyson53/SUR,dimtruck/magnum,LaynePeng/magnum,hongbin/magnum,ArchiFleKs/magnum,annegentle/magnum,openstack/magnum,ddepaoli3/magnum,ChengTiesheng/magnum,openstack/magnum,Tennyson53/SUR,sajuptpm/magnum,ramielrowe/magnum,ArchiFleKs/magnum,annegentle/magnum,ChengTiesheng/magnum,mjbrewer/testindex,Alzon/SUR,hongbin/magnum,ramielrowe/magnum,dimtruck/magnum