Update link reference in Swift document
Update link reference in Swift document

The reference link for REST API [1] is out of date. We should change
it to the new one [2].

[1]:http://developer.openstack.org/api-ref-objectstorage-v1.html
[2]:http://developer.openstack.org/api-ref/object-storage/

Change-Id: Ib3e5a78ec2df0591f862671272f51ace5ac65ca7

redbo/swift,clayg/swift,openstack/swift,clayg/swift,hurricanerix/swift,nadeemsyed/swift,tipabu/swift,smerritt/swift,clayg/swift,psachin/swift,openstack/swift,redbo/swift,matthewoliver/swift,openstack/swift,notmyname/swift,smerritt/swift,hurricanerix/swift,swiftstack/swift,notmyname/swift,tipabu/swift,smerritt/swift,smerritt/swift,swiftstack/swift,matthewoliver/swift,tipabu/swift,psachin/swift,hurricanerix/swift,notmyname/swift,psachin/swift,openstack/swift,matthewoliver/swift,nadeemsyed/swift,nadeemsyed/swift,swiftstack/swift,psachin/swift,nadeemsyed/swift,clayg/swift,tipabu/swift,matthewoliver/swift,hurricanerix/swift,notmyname/swift