Improve grammar in CI documentation for build vars
Improve grammar in CI documentation for build vars

SVArago/gitlabhq,axilleas/gitlabhq,iiet/iiet-git,icedwater/gitlabhq,stoplightio/gitlabhq,dreampet/gitlab,jirutka/gitlabhq,SVArago/gitlabhq,mr-dxdy/gitlabhq,LUMC/gitlabhq,mr-dxdy/gitlabhq,Soullivaneuh/gitlabhq,mmkassem/gitlabhq,daiyu/gitlab-zh,icedwater/gitlabhq,allysonbarros/gitlabhq,LUMC/gitlabhq,larryli/gitlabhq,martijnvermaat/gitlabhq,martijnvermaat/gitlabhq,dplarson/gitlabhq,shinexiao/gitlabhq,darkrasid/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,stoplightio/gitlabhq,iiet/iiet-git,stoplightio/gitlabhq,SVArago/gitlabhq,screenpages/gitlabhq,mmkassem/gitlabhq,t-zuehlsdorff/gitlabhq,axilleas/gitlabhq,martijnvermaat/gitlabhq,axilleas/gitlabhq,htve/GitlabForChinese,dplarson/gitlabhq,jirutka/gitlabhq,martijnvermaat/gitlabhq,t-zuehlsdorff/gitlabhq,Soullivaneuh/gitlabhq,daiyu/gitlab-zh,dplarson/gitlabhq,allysonbarros/gitlabhq,stoplightio/gitlabhq,axilleas/gitlabhq,darkrasid/gitlabhq,SVArago/gitlabhq,dwrensha/gitlabhq,larryli/gitlabhq,htve/GitlabForChinese,darkrasid/gitlabhq,openwide-java/gitlabhq,larryli/gitlabhq,shinexiao/gitlabhq,iiet/iiet-git,htve/GitlabForChinese,larryli/gitlabhq,screenpages/gitlabhq,screenpages/gitlabhq,allysonbarros/gitlabhq,dreampet/gitlab,openwide-java/gitlabhq,LUMC/gitlabhq,shinexiao/gitlabhq,LUMC/gitlabhq,mmkassem/gitlabhq,jirutka/gitlabhq,daiyu/gitlab-zh,mmkassem/gitlabhq,dreampet/gitlab,dplarson/gitlabhq,shinexiao/gitlabhq,iiet/iiet-git,icedwater/gitlabhq,screenpages/gitlabhq,mr-dxdy/gitlabhq,jirutka/gitlabhq,htve/GitlabForChinese,Soullivaneuh/gitlabhq,allysonbarros/gitlabhq,t-zuehlsdorff/gitlabhq,daiyu/gitlab-zh,openwide-java/gitlabhq,mr-dxdy/gitlabhq,dwrensha/gitlabhq,openwide-java/gitlabhq,dwrensha/gitlabhq,Soullivaneuh/gitlabhq,dwrensha/gitlabhq,icedwater/gitlabhq,t-zuehlsdorff/gitlabhq