Extend registry docs regarding multi-level repositories
Extend registry docs regarding multi-level repositories

t-zuehlsdorff/gitlabhq,darkrasid/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,htve/GitlabForChinese,dplarson/gitlabhq,darkrasid/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,t-zuehlsdorff/gitlabhq,htve/GitlabForChinese,axilleas/gitlabhq,dreampet/gitlab,axilleas/gitlabhq,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,darkrasid/gitlabhq,iiet/iiet-git,dplarson/gitlabhq,dplarson/gitlabhq,htve/GitlabForChinese,stoplightio/gitlabhq,jirutka/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,jirutka/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,jirutka/gitlabhq,dreampet/gitlab