Document that GITLAB_CDN_HOST takes an base URL
Document that GITLAB_CDN_HOST takes an base URL

Signed-off-by: Bastian Blank <4dbfe864e4d78091f699c03e2b5c8bc8f535e579@debian.org>

mmkassem/gitlabhq,jirutka/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,jirutka/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,jirutka/gitlabhq,mmkassem/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,dreampet/gitlab,dreampet/gitlab,axilleas/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,iiet/iiet-git,iiet/iiet-git,axilleas/gitlabhq,stoplightio/gitlabhq