The link http://docs.openstack.org/developer/openstack-projects.html
contains project-specific documentation for OpenStack services and
libraries.
And here you will see kolla home-page url as follow:
http://docs.openstack.org/developer/kolla/

TrivialFix.

Change-Id: I77d822f3f7211d02d58529128f9b37d6096ca32a