using_docker_images.md: document services inheriting dns and addn hosts settings
using_docker_images.md: document services inheriting dns and addn hosts settings

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