Update docs for shared runner default settings
Update docs for shared runner default settings

Fixes #5993

darkrasid/gitlabhq,mrb/gitlabhq,openwide-java/gitlabhq,axilleas/gitlabhq,shinexiao/gitlabhq,htve/GitlabForChinese,jrjang/gitlab-ce,jrjang/gitlabhq,darkrasid/gitlabhq,duduribeiro/gitlabhq,SVArago/gitlabhq,larryli/gitlabhq,icedwater/gitlabhq,LUMC/gitlabhq,Datacom/gitlabhq,daiyu/gitlab-zh,yatish27/gitlabhq,Soullivaneuh/gitlabhq,ttasanen/gitlabhq,axilleas/gitlabhq,dwrensha/gitlabhq,larryli/gitlabhq,axilleas/gitlabhq,t-zuehlsdorff/gitlabhq,martijnvermaat/gitlabhq,stoplightio/gitlabhq,screenpages/gitlabhq,shinexiao/gitlabhq,jrjang/gitlab-ce,dplarson/gitlabhq,icedwater/gitlabhq,daiyu/gitlab-zh,yatish27/gitlabhq,larryli/gitlabhq,mrb/gitlabhq,allysonbarros/gitlabhq,LUMC/gitlabhq,dwrensha/gitlabhq,allysonbarros/gitlabhq,mmkassem/gitlabhq,ttasanen/gitlabhq,larryli/gitlabhq,mr-dxdy/gitlabhq,ttasanen/gitlabhq,Soullivaneuh/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,t-zuehlsdorff/gitlabhq,mr-dxdy/gitlabhq,allysonbarros/gitlabhq,screenpages/gitlabhq,stoplightio/gitlabhq,screenpages/gitlabhq,jrjang/gitlabhq,martijnvermaat/gitlabhq,dwrensha/gitlabhq,shinexiao/gitlabhq,allysonbarros/gitlabhq,jrjang/gitlab-ce,t-zuehlsdorff/gitlabhq,darkrasid/gitlabhq,duduribeiro/gitlabhq,ttasanen/gitlabhq,dplarson/gitlabhq,martijnvermaat/gitlabhq,Datacom/gitlabhq,mmkassem/gitlabhq,icedwater/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,dreampet/gitlab,htve/GitlabForChinese,shinexiao/gitlabhq,mmkassem/gitlabhq,daiyu/gitlab-zh,jrjang/gitlabhq,jirutka/gitlabhq,openwide-java/gitlabhq,axilleas/gitlabhq,dplarson/gitlabhq,LUMC/gitlabhq,SVArago/gitlabhq,LUMC/gitlabhq,iiet/iiet-git,daiyu/gitlab-zh,jrjang/gitlab-ce,jirutka/gitlabhq,jirutka/gitlabhq,dreampet/gitlab,darkrasid/gitlabhq,screenpages/gitlabhq,t-zuehlsdorff/gitlabhq,mrb/gitlabhq,iiet/iiet-git,Soullivaneuh/gitlabhq,stoplightio/gitlabhq,htve/GitlabForChinese,SVArago/gitlabhq,yatish27/gitlabhq,duduribeiro/gitlabhq,duduribeiro/gitlabhq,mr-dxdy/gitlabhq,dreampet/gitlab,mr-dxdy/gitlabhq,htve/GitlabForChinese,dwrensha/gitlabhq,mrb/gitlabhq,yatish27/gitlabhq,openwide-java/gitlabhq,iiet/iiet-git,Datacom/gitlabhq,Soullivaneuh/gitlabhq,openwide-java/gitlabhq,martijnvermaat/gitlabhq,stoplightio/gitlabhq,SVArago/gitlabhq,dplarson/gitlabhq,Datacom/gitlabhq,jrjang/gitlabhq,icedwater/gitlabhq