Doc: update sourcing of ZK_CLIENT_CONFIG
Doc: update sourcing of ZK_CLIENT_CONFIG

Otherwise 'zk' commands will fail. This will help beginners.

yangzhongj/vitess,mattharden/vitess,cgvarela/vitess,kuipertan/vitess,dumbunny/vitess,guokeno0/vitess,yangzhongj/vitess,tinyspeck/vitess,kmiku7/vitess-annotated,dumbunny/vitess,erzel/vitess,mattharden/vitess,mapbased/vitess,rnavarro/vitess,skyportsystems/vitess,cloudbearings/vitess,HubSpot/vitess,fengshao0907/vitess,mlc0202/vitess,rnavarro/vitess,kmiku7/vitess-annotated,dumbunny/vitess,atyenoria/vitess,rnavarro/vitess,davygeek/vitess,fengshao0907/vitess,kmiku7/vitess-annotated,mattharden/vitess,atyenoria/vitess,anusornc/vitess,guokeno0/vitess,anusornc/vitess,xgwubin/vitess,tinyspeck/vitess,nurblieh/vitess,michael-berlin/vitess,aaijazi/vitess,dcadevil/vitess,michael-berlin/vitess,HubSpot/vitess,vitessio/vitess,dumbunny/vitess,sougou/vitess,kuipertan/vitess,applift/vitess,xgwubin/vitess,aaijazi/vitess,anusornc/vitess,dcadevil/vitess,cgvarela/vitess,ptomasroos/vitess,erzel/vitess,kuipertan/vitess,dcadevil/vitess,mapbased/vitess,AndyDiamondstein/vitess,mahak/vitess,sougou/vitess,kmiku7/vitess-annotated,aaijazi/vitess,guokeno0/vitess,aaijazi/vitess,nurblieh/vitess,skyportsystems/vitess,pivanof/vitess,cloudbearings/vitess,vitessio/vitess,yaoshengzhe/vitess,tirsen/vitess,alainjobart/vitess,rnavarro/vitess,AndyDiamondstein/vitess,erzel/vitess,netroby/vitess,kmiku7/vitess-annotated,alainjobart/vitess,cloudbearings/vitess,atyenoria/vitess,erzel/vitess,rnavarro/vitess,davygeek/vitess,cgvarela/vitess,cloudbearings/vitess,ptomasroos/vitess,guokeno0/vitess,SDHM/vitess,anusornc/vitess,tjyang/vitess,mlc0202/vitess,yangzhongj/vitess,mahak/vitess,nurblieh/vitess,enisoc/vitess,mahak/vitess,yaoshengzhe/vitess,michael-berlin/vitess,tinyspeck/vitess,guokeno0/vitess,cloudbearings/vitess,nurblieh/vitess,ptomasroos/vitess,AndyDiamondstein/vitess,cloudbearings/vitess,nurblieh/vitess,fengshao0907/vitess,anusornc/vitess,anusornc/vitess,xgwubin/vitess,tinyspeck/vitess,rnavarro/vitess,vitessio/vitess,xgwubin/vitess,applift/vitess,fengshao0907/vitess,yangzhongj/vitess,cloudbearings/vitess,mahak/vitess,sougou/vitess,AndyDiamondstein/vitess,skyportsystems/vitess,netroby/vitess,fengshao0907/vitess,HubSpot/vitess,mattharden/vitess,enisoc/vitess,atyenoria/vitess,vitessio/vitess,yaoshengzhe/vitess,michael-berlin/vitess,xgwubin/vitess,anusornc/vitess,erzel/vitess,guokeno0/vitess,tinyspeck/vitess,yangzhongj/vitess,alainjobart/vitess,anusornc/vitess,sougou/vitess,dumbunny/vitess,sougou/vitess,davygeek/vitess,tjyang/vitess,mahak/vitess,tirsen/vitess,SDHM/vitess,tirsen/vitess,enisoc/vitess,sougou/vitess,ptomasroos/vitess,atyenoria/vitess,kuipertan/vitess,vitessio/vitess,mapbased/vitess,pivanof/vitess,rnavarro/vitess,SDHM/vitess,fengshao0907/vitess,yaoshengzhe/vitess,dcadevil/vitess,tjyang/vitess,dumbunny/vitess,ptomasroos/vitess,pivanof/vitess,ptomasroos/vitess,atyenoria/vitess,davygeek/vitess,tinyspeck/vitess,guokeno0/vitess,applift/vitess,tirsen/vitess,AndyDiamondstein/vitess,michael-berlin/vitess,tjyang/vitess,tjyang/vitess,mlc0202/vitess,dumbunny/vitess,enisoc/vitess,cgvarela/vitess,mattharden/vitess,xgwubin/vitess,SDHM/vitess,dcadevil/vitess,mattharden/vitess,kuipertan/vitess,dcadevil/vitess,skyportsystems/vitess,vitessio/vitess,nurblieh/vitess,AndyDiamondstein/vitess,applift/vitess,mahak/vitess,vitessio/vitess,kuipertan/vitess,mattharden/vitess,yangzhongj/vitess,tjyang/vitess,rnavarro/vitess,applift/vitess,erzel/vitess,mahak/vitess,michael-berlin/vitess,mlc0202/vitess,ptomasroos/vitess,SDHM/vitess,skyportsystems/vitess,kuipertan/vitess,skyportsystems/vitess,netroby/vitess,nurblieh/vitess,kmiku7/vitess-annotated,erzel/vitess,cloudbearings/vitess,xgwubin/vitess,cgvarela/vitess,kmiku7/vitess-annotated,davygeek/vitess,cgvarela/vitess,yangzhongj/vitess,aaijazi/vitess,ptomasroos/vitess,michael-berlin/vitess,fengshao0907/vitess,mapbased/vitess,yaoshengzhe/vitess,dumbunny/vitess,tirsen/vitess,SDHM/vitess,davygeek/vitess,fengshao0907/vitess,guokeno0/vitess,alainjobart/vitess,erzel/vitess,netroby/vitess,alainjobart/vitess,yaoshengzhe/vitess,atyenoria/vitess,AndyDiamondstein/vitess,yaoshengzhe/vitess,cgvarela/vitess,skyportsystems/vitess,alainjobart/vitess,nurblieh/vitess,mapbased/vitess,aaijazi/vitess,applift/vitess,netroby/vitess,AndyDiamondstein/vitess,kuipertan/vitess,tjyang/vitess,xgwubin/vitess,alainjobart/vitess,sougou/vitess,skyportsystems/vitess,HubSpot/vitess,tirsen/vitess,anusornc/vitess,vitessio/vitess,applift/vitess,cgvarela/vitess,HubSpot/vitess,nurblieh/vitess,applift/vitess,mattharden/vitess,skyportsystems/vitess,aaijazi/vitess,kmiku7/vitess-annotated,atyenoria/vitess,atyenoria/vitess,aaijazi/vitess,rnavarro/vitess,mattharden/vitess,xgwubin/vitess,davygeek/vitess,tinyspeck/vitess,HubSpot/vitess,kuipertan/vitess,fengshao0907/vitess,SDHM/vitess,enisoc/vitess,mattharden/vitess,mapbased/vitess,HubSpot/vitess,cgvarela/vitess,tjyang/vitess,erzel/vitess,tjyang/vitess,applift/vitess,mahak/vitess,netroby/vitess,AndyDiamondstein/vitess,dumbunny/vitess,netroby/vitess,applift/vitess,SDHM/vitess,yangzhongj/vitess,mlc0202/vitess,mlc0202/vitess,mlc0202/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