export: Add comments to export_single_user().
export: Add comments to export_single_user().

(This is a bit of a prefactoring to hopefully create a nice
diff in a subsequent commit.)

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