Fix the incorrect reference links
Fix the incorrect reference links

TrivialFix
[1] is the installation guide for OpenStack components, obviously,
we need [1] in the docs.

[1] https://docs.openstack.org/latest/install/

Change-Id: I5a46d7b9f6a1cf67d06e3fd121b8c60d227a23f7

stackforge/ec2-api,openstack/ec2-api,openstack/ec2-api,stackforge/ec2-api