Doc update for 'magnum coe-service-*'
Doc update for 'magnum coe-service-*'

As per bug#1487580, we are renaming all 'magnum service-*' CLIs to
'magnum coe-service-*'.

Change-Id: I4cb60a0b91d69b97413b00e7c9f2febf650f80bb
Partially-Implements: blueprint magnum-service-list
Closes-bug: #1488663
Depends-On: Ia4ee95e324087309b7f771b3a9d4930b8d8589cf

eshijia/magnum,annegentle/magnum,dimtruck/magnum,ArchiFleKs/magnum,Tennyson53/magnum,Tennyson53/SUR,ArchiFleKs/magnum,openstack/magnum,Alzon/SUR,Tennyson53/magnum,Tennyson53/SUR,openstack/magnum,eshijia/SUR,eshijia/magnum,Alzon/SUR,mjbrewer/testindex,mjbrewer/testindex,mjbrewer/testindex,eshijia/SUR,dimtruck/magnum,annegentle/magnum,jay-lau/magnum