Changes documentation hyperlinks to be relative
Changes documentation hyperlinks to be relative

On the "System Architecture" page of the developer documentation there
are hyperlinks to sections of the API documentation. These hyperlinks
assumed that the documentation has been placed in the web root and
did not work for documentation in a subdirectory. The hyperlinks
were changed to be relative.

Fixes bug: #1206569

Change-Id: Id2bffbeaba1a41f7e9f76f7eb5a849d66703a7e7

openstack/ironic,ionutbalutoiu/ironic,supermari0/ironic,dims/ironic,JioCloud/ironic,redhat-openstack/ironic,SauloAislan/ironic,hpproliant/ironic,devananda/ironic,froyobin/ironic,Tehsmash/ironic,SauloAislan/ironic,naototty/vagrant-lxc-ironic,citrix-openstack-build/ironic,NaohiroTamura/ironic,naterh/ironic,Tan0/ironic,pshchelo/ironic,faizan-barmawer/openstack_ironic,bacaldwell/ironic,NaohiroTamura/ironic,rdo-management/ironic,ramineni/myironic,rackerlabs/ironic,citrix-openstack-build/ironic,bacaldwell/ironic,varunarya10/ironic,dims/ironic,pshchelo/ironic,naototty/vagrant-lxc-ironic,debayanray/ironic_backup,ionutbalutoiu/ironic,openstack/ironic