Update casper testing documentation.
Update casper testing documentation.

This adds a note that waitFor functions cannot be chained together if
the wait can cause race condition.

niftynei/zulip,timabbott/zulip,dattatreya303/zulip,christi3k/zulip,zacps/zulip,rht/zulip,isht3/zulip,dawran6/zulip,vikas-parashar/zulip,reyha/zulip,shubhamdhama/zulip,aakash-cr7/zulip,samatdav/zulip,KingxBanana/zulip,PhilSk/zulip,andersk/zulip,arpith/zulip,jackrzhang/zulip,aakash-cr7/zulip,zulip/zulip,samatdav/zulip,brainwane/zulip,dhcrzf/zulip,rishig/zulip,vikas-parashar/zulip,sharmaeklavya2/zulip,jrowan/zulip,sharmaeklavya2/zulip,tommyip/zulip,rht/zulip,dawran6/zulip,AZtheAsian/zulip,vikas-parashar/zulip,Galexrt/zulip,kou/zulip,amyliu345/zulip,andersk/zulip,Juanvulcano/zulip,timabbott/zulip,punchagan/zulip,rishig/zulip,ahmadassaf/zulip,jrowan/zulip,krtkmj/zulip,brainwane/zulip,andersk/zulip,jackrzhang/zulip,peguin40/zulip,JPJPJPOPOP/zulip,JPJPJPOPOP/zulip,grave-w-grave/zulip,ahmadassaf/zulip,kou/zulip,peguin40/zulip,j831/zulip,JPJPJPOPOP/zulip,vikas-parashar/zulip,joyhchen/zulip,Jianchun1/zulip,synicalsyntax/zulip,shubhamdhama/zulip,amanharitsh123/zulip,Juanvulcano/zulip,hackerkid/zulip,jrowan/zulip,joyhchen/zulip,eeshangarg/zulip,sonali0901/zulip,zulip/zulip,sonali0901/zulip,KingxBanana/zulip,niftynei/zulip,jackrzhang/zulip,isht3/zulip,jainayush975/zulip,blaze225/zulip,AZtheAsian/zulip,zulip/zulip,verma-varsha/zulip,Jianchun1/zulip,Diptanshu8/zulip,Galexrt/zulip,timabbott/zulip,umkay/zulip,showell/zulip,paxapy/zulip,jphilipsen05/zulip,dawran6/zulip,christi3k/zulip,tommyip/zulip,synicalsyntax/zulip,aakash-cr7/zulip,reyha/zulip,showell/zulip,arpith/zulip,blaze225/zulip,aakash-cr7/zulip,rishig/zulip,jainayush975/zulip,verma-varsha/zulip,joyhchen/zulip,punchagan/zulip,calvinleenyc/zulip,susansls/zulip,niftynei/zulip,hackerkid/zulip,rishig/zulip,brockwhittaker/zulip,dattatreya303/zulip,PhilSk/zulip,dawran6/zulip,TigorC/zulip,vaidap/zulip,reyha/zulip,Galexrt/zulip,Jianchun1/zulip,rishig/zulip,cosmicAsymmetry/zulip,Diptanshu8/zulip,mahim97/zulip,peguin40/zulip,amyliu345/zulip,isht3/zulip,sup95/zulip,Juanvulcano/zulip,sup95/zulip,krtkmj/zulip,zacps/zulip,TigorC/zulip,shubhamdhama/zulip,rht/zulip,vaidap/zulip,niftynei/zulip,PhilSk/zulip,ahmadassaf/zulip,grave-w-grave/zulip,dawran6/zulip,rht/zulip,sonali0901/zulip,brockwhittaker/zulip,christi3k/zulip,jackrzhang/zulip,jphilipsen05/zulip,sup95/zulip,sharmaeklavya2/zulip,dawran6/zulip,tommyip/zulip,brainwane/zulip,susansls/zulip,mahim97/zulip,jrowan/zulip,jainayush975/zulip,souravbadami/zulip,verma-varsha/zulip,souravbadami/zulip,susansls/zulip,j831/zulip,paxapy/zulip,PhilSk/zulip,kou/zulip,jainayush975/zulip,shubhamdhama/zulip,calvinleenyc/zulip,Juanvulcano/zulip,amyliu345/zulip,mohsenSy/zulip,AZtheAsian/zulip,kou/zulip,samatdav/zulip,amyliu345/zulip,christi3k/zulip,reyha/zulip,isht3/zulip,brainwane/zulip,zulip/zulip,zulip/zulip,zacps/zulip,amanharitsh123/zulip,hackerkid/zulip,mohsenSy/zulip,cosmicAsymmetry/zulip,cosmicAsymmetry/zulip,SmartPeople/zulip,vabs22/zulip,mohsenSy/zulip,shubhamdhama/zulip,punchagan/zulip,amyliu345/zulip,zulip/zulip,rht/zulip,ahmadassaf/zulip,j831/zulip,KingxBanana/zulip,timabbott/zulip,joyhchen/zulip,jackrzhang/zulip,Juanvulcano/zulip,mahim97/zulip,ahmadassaf/zulip,calvinleenyc/zulip,souravbadami/zulip,dattatreya303/zulip,samatdav/zulip,cosmicAsymmetry/zulip,timabbott/zulip,eeshangarg/zulip,ryanbackman/zulip,krtkmj/zulip,andersk/zulip,zacps/zulip,ryanbackman/zulip,andersk/zulip,samatdav/zulip,vabs22/zulip,JPJPJPOPOP/zulip,jackrzhang/zulip,AZtheAsian/zulip,vikas-parashar/zulip,niftynei/zulip,j831/zulip,JPJPJPOPOP/zulip,paxapy/zulip,showell/zulip,timabbott/zulip,tommyip/zulip,shubhamdhama/zulip,Diptanshu8/zulip,jainayush975/zulip,tommyip/zulip,dhcrzf/zulip,paxapy/zulip,peguin40/zulip,eeshangarg/zulip,showell/zulip,ryanbackman/zulip,rishig/zulip,kou/zulip,dhcrzf/zulip,dattatreya303/zulip,sharmaeklavya2/zulip,andersk/zulip,Galexrt/zulip,cosmicAsymmetry/zulip,sup95/zulip,brockwhittaker/zulip,brainwane/zulip,KingxBanana/zulip,PhilSk/zulip,SmartPeople/zulip,dattatreya303/zulip,cosmicAsymmetry/zulip,vikas-parashar/zulip,mohsenSy/zulip,amanharitsh123/zulip,verma-varsha/zulip,Jianchun1/zulip,brockwhittaker/zulip,ahmadassaf/zulip,Galexrt/zulip,eeshangarg/zulip,eeshangarg/zulip,Jianchun1/zulip,zulip/zulip,brockwhittaker/zulip,krtkmj/zulip,krtkmj/zulip,jphilipsen05/zulip,umkay/zulip,calvinleenyc/zulip,grave-w-grave/zulip,samatdav/zulip,mahim97/zulip,andersk/zulip,paxapy/zulip,sonali0901/zulip,rishig/zulip,jainayush975/zulip,jrowan/zulip,blaze225/zulip,dhcrzf/zulip,punchagan/zulip,jrowan/zulip,vaidap/zulip,sharmaeklavya2/zulip,SmartPeople/zulip,dhcrzf/zulip,sonali0901/zulip,punchagan/zulip,vaidap/zulip,umkay/zulip,showell/zulip,vabs22/zulip,SmartPeople/zulip,j831/zulip,synicalsyntax/zulip,amanharitsh123/zulip,blaze225/zulip,grave-w-grave/zulip,TigorC/zulip,Diptanshu8/zulip,arpith/zulip,peguin40/zulip,synicalsyntax/zulip,Diptanshu8/zulip,blaze225/zulip,sup95/zulip,calvinleenyc/zulip,calvinleenyc/zulip,timabbott/zulip,shubhamdhama/zulip,ryanbackman/zulip,peguin40/zulip,synicalsyntax/zulip,vabs22/zulip,umkay/zulip,rht/zulip,dhcrzf/zulip,christi3k/zulip,mahim97/zulip,reyha/zulip,tommyip/zulip,arpith/zulip,kou/zulip,Jianchun1/zulip,showell/zulip,amanharitsh123/zulip,zacps/zulip,paxapy/zulip,Galexrt/zulip,hackerkid/zulip,umkay/zulip,souravbadami/zulip,eeshangarg/zulip,sonali0901/zulip,joyhchen/zulip,arpith/zulip,verma-varsha/zulip,susansls/zulip,jphilipsen05/zulip,krtkmj/zulip,zacps/zulip,synicalsyntax/zulip,jphilipsen05/zulip,grave-w-grave/zulip,aakash-cr7/zulip,KingxBanana/zulip,susansls/zulip,AZtheAsian/zulip,brainwane/zulip,punchagan/zulip,PhilSk/zulip,blaze225/zulip,ahmadassaf/zulip,vabs22/zulip,j831/zulip,jphilipsen05/zulip,souravbadami/zulip,arpith/zulip,joyhchen/zulip,synicalsyntax/zulip,rht/zulip,reyha/zulip,AZtheAsian/zulip,susansls/zulip,JPJPJPOPOP/zulip,SmartPeople/zulip,sup95/zulip,jackrzhang/zulip,dhcrzf/zulip,isht3/zulip,TigorC/zulip,umkay/zulip,niftynei/zulip,hackerkid/zulip,ryanbackman/zulip,krtkmj/zulip,isht3/zulip,amyliu345/zulip,hackerkid/zulip,showell/zulip,mohsenSy/zulip,brockwhittaker/zulip,souravbadami/zulip,verma-varsha/zulip,mohsenSy/zulip,kou/zulip,TigorC/zulip,tommyip/zulip,brainwane/zulip,hackerkid/zulip,Juanvulcano/zulip,dattatreya303/zulip,grave-w-grave/zulip,SmartPeople/zulip,TigorC/zulip,mahim97/zulip,vaidap/zulip,KingxBanana/zulip,ryanbackman/zulip,sharmaeklavya2/zulip,vaidap/zulip,Diptanshu8/zulip,punchagan/zulip,umkay/zulip,amanharitsh123/zulip,christi3k/zulip,Galexrt/zulip,vabs22/zulip,aakash-cr7/zulip,eeshangarg/zulip