docs/testing.rst: Fix typo and name of a package.
docs/testing.rst: Fix typo and name of a package.

* Remove duplicate words.
* Replace `futurize` by `future`.

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