Add docs for pipeline coverage
Add docs for pipeline coverage

[ci skip]

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