Clarify documentation on how to add custom Omniauth provider to GitLab
Clarify documentation on how to add custom Omniauth provider to GitLab

ZeoAlliance/gitlabhq,whluwit/gitlabhq,cncodog/gitlab,aaronsnyder/gitlabhq,vjustov/gitlabhq,initiummedia/gitlabhq,SkyWei/gitlabhq,joalmeid/gitlabhq,jairzh/gitlabhq-sfdc,iiet/iiet-git,initiummedia/gitlabhq,flashbuckets/gitlabhq,dwrensha/gitlabhq,8thcolor/eurucamp2014-htdsadr,screenpages/gitlabhq,martinma4/gitlabhq,wangcan2014/gitlabhq,Tyrael/gitlabhq,fearenales/gitlabhq,louahola/gitlabhq,martinma4/gitlabhq,openwide-java/gitlabhq,shinexiao/gitlabhq,whluwit/gitlabhq,TheWatcher/gitlabhq,jrjang/gitlabhq,kemenaran/gitlabhq,SVArago/gitlabhq,yuyue2013/ss,mathstuf/gitlabhq,luzhongyang/gitlabhq,luzhongyang/gitlabhq,sekcheong/gitlabhq,jirutka/gitlabhq,jairzh/gitlabhq-sfdc,yulchitaj/TEST3,mente/gitlabhq,theonlydoo/gitlabhq,atomaka/gitlabhq,Razer6/gitlabhq,aaronsnyder/gitlabhq,NARKOZ/gitlabhq,rumpelsepp/gitlabhq,Tyrael/gitlabhq,phinfonet/mobbr-gitlabhq,pulkit21/gitlabhq,WSDC-NITWarangal/gitlabhq,k4zzk/gitlabhq,NKMR6194/gitlabhq,ZeoAlliance/gitlabhq,kitech/gitlabhq,akumetsuv/gitlab,ayufan/gitlabhq,bozaro/gitlabhq,yonglehou/gitlabhq,Devin001/gitlabhq,fpgentil/gitlabhq,akumetsuv/gitlab,jrjang/gitlab-ce,icedwater/gitlabhq,sue445/gitlabhq,Kambda/mobbr-gitlabhq,fgbreel/gitlabhq,allysonbarros/gitlabhq,jirutka/gitlabhq,zBMNForks/gitlabhq,bladealslayer/gitlabhq,hq804116393/gitlabhq,sakishum/gitlabhq,rumpelsepp/gitlabhq,rfeese/gitlab-ce,chadyred/gitlabhq,cinderblock/gitlabhq,nguyen-tien-mulodo/gitlabhq,ttasanen/gitlabhq,youprofit/gitlabhq,LytayTOUCH/gitlabhq,NKMR6194/gitlabhq,jaepyoung/gitlabhq,darkrasid/gitlabhq,allysonbarros/gitlabhq,gorgee/gitlabhq,Exeia/gitlabhq,bozaro/gitlabhq,vjustov/gitlabhq,t-zuehlsdorff/gitlabhq,yama07/gitlabhq,ngpestelos/gitlabhq,ksoichiro/gitlabhq,Keystion/gitlabhq,fantasywind/gitlabhq,k4zzk/gitlabhq,8thcolor/testing-public-gitlabhq,Devin001/gitlabhq,flashbuckets/gitlabhq,Datacom/gitlabhq,axilleas/gitlabhq,childbamboo/gitlabhq,daiyu/gitlab-zh,michaKFromParis/sparkslab,dplarson/gitlabhq,sideci-sample/sideci-sample-gitlabhq,zrbsprite/gitlabhq,fscherwi/gitlabhq,tk23/gitlabhq,mr-dxdy/gitlabhq,rfeese/gitlab-ce,copystudy/gitlabhq,mr-dxdy/gitlabhq,ArthurHoaro/Public-GitLab,michaKFromParis/gitlabhq,kotaro-dev/gitlab-6-9,H3Chief/gitlabhq,iiet/iiet-git,windymid/test2,ferdinandrosario/gitlabhq,Kambda/Mobbr,sue445/gitlabhq,johnmyqin/gitlabhq,yuyue2013/ss,bbodenmiller/gitlabhq,t-zuehlsdorff/gitlabhq,eliasp/gitlabhq,SVArago/gitlabhq,larryli/gitlabhq,larryli/gitlabhq,shinexiao/gitlabhq,aaronsnyder/gitlabhq,jirutka/gitlabhq,OlegGirko/gitlab-ce,Datacom/gitlabhq,tim-hoff/gitlabhq,ordiychen/gitlabhq,sideci-sample/sideci-sample-gitlabhq,stoplightio/gitlabhq,eliasp/gitlabhq,dvrylc/gitlabhq,pjknkda/gitlabhq,fpgentil/gitlabhq,yatish27/gitlabhq,dukex/gitlabhq,Razer6/gitlabhq,tim-hoff/gitlabhq,yama07/gitlabhq,youprofit/gitlabhq,yonglehou/gitlabhq,stanhu/gitlabhq,bigsurge/gitlabhq,ayufan/gitlabhq,TheWatcher/gitlabhq,pkgr/gitlabhq,it33/gitlabhq,zBMNForks/gitlabhq,MauriceMohlek/gitlabhq,bozaro/gitlabhq,manfer/gitlabhq,chenrui2014/gitlabhq,dukex/gitlabhq,goeun/myRepo,per-garden/gitlabhq,hzy001/gitlabhq,TheWatcher/gitlabhq,williamherry/gitlabhq,tempbottle/gitlabhq,initiummedia/gitlabhq,tk23/gitlabhq,michaKFromParis/gitlabhq,flashbuckets/gitlabhq,mente/gitlabhq,achako/gitlabhq,williamherry/gitlabhq,DanielZhangQingLong/gitlabhq,michaKFromParis/sparkslab,mavimo/gitlabhq,dwrensha/gitlabhq,WSDC-NITWarangal/gitlabhq,fearenales/gitlabhq,jrjang/gitlab-ce,wangcan2014/gitlabhq,theonlydoo/gitlabhq,cui-liqiang/gitlab-ce,copystudy/gitlabhq,Datacom/gitlabhq,julianengel/gitlabhq,yatish27/gitlabhq,koreamic/gitlabhq,stoplightio/gitlabhq,8thcolor/testing-public-gitlabhq,tempbottle/gitlabhq,since2014/gitlabhq,chadyred/gitlabhq,martijnvermaat/gitlabhq,mathstuf/gitlabhq,yulchitaj/TEST3,dreampet/gitlab,michaKFromParis/sparkslab,youprofit/gitlabhq,kotaro-dev/gitlab-6-9,fendoudeqingchunhh/gitlabhq,jrjang/gitlabhq,tim-hoff/gitlabhq,jvanbaarsen/gitlabhq,johnmyqin/gitlabhq,manfer/gitlabhq,childbamboo/gitlabhq,jairzh/gitlabhq-sfdc,jrjang/gitlab-ce,koreamic/gitlabhq,hacsoc/gitlabhq,it33/gitlabhq,michaKFromParis/sparkslab,pjknkda/gitlabhq,ArthurHoaro/Public-GitLab,ArthurHoaro/Public-GitLab,openwide-java/gitlabhq,k4zzk/gitlabhq,hacsoc/gitlabhq,since2014/gitlabhq,htve/GitlabForChinese,mr-dxdy/gitlabhq,DanielZhangQingLong/gitlabhq,LytayTOUCH/gitlabhq,dvrylc/gitlabhq,louahola/gitlabhq,windymid/test2,rhels/gitlabhq,Keystion/gitlabhq,yonglehou/gitlabhq,0x20h/gitlabhq,chadyred/gitlabhq,8thcolor/eurucamp2014-htdsadr,Datacom/gitlabhq,mente/gitlabhq,folpindo/gitlabhq,fantasywind/gitlabhq,tempbottle/gitlabhq,jrjang/gitlabhq,bozaro/gitlabhq,williamherry/gitlabhq,salipro4ever/gitlabhq,yama07/gitlabhq,allistera/gitlabhq,flashbuckets/gitlabhq,Kambda/mobbr-gitlabhq,yatish27/gitlabhq,mrb/gitlabhq,rfeese/gitlab-ce,mathstuf/gitlabhq,sekcheong/gitlabhq,sue445/gitlabhq,rhels/gitlabhq,johnmyqin/gitlabhq,tk23/gitlabhq,bigsurge/gitlabhq,mrb/gitlabhq,gopeter/gitlabhq,MauriceMohlek/gitlabhq,childbamboo/gitlabhq,allistera/gitlabhq,hzy001/gitlabhq,openwide-java/gitlabhq,eliasp/gitlabhq,win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