Add improvements to integration-guide.md.
Add improvements to integration-guide.md.

Fix some typos, add a few sentences that might clear it a little.

showell/zulip,zulip/zulip,PhilSk/zulip,dattatreya303/zulip,brainwane/zulip,Galexrt/zulip,shubhamdhama/zulip,vaidap/zulip,christi3k/zulip,jphilipsen05/zulip,vabs22/zulip,SmartPeople/zulip,j831/zulip,j831/zulip,blaze225/zulip,rht/zulip,vabs22/zulip,blaze225/zulip,rht/zulip,JPJPJPOPOP/zulip,hackerkid/zulip,brockwhittaker/zulip,christi3k/zulip,dhcrzf/zulip,timabbott/zulip,shubhamdhama/zulip,dhcrzf/zulip,susansls/zulip,synicalsyntax/zulip,verma-varsha/zulip,jainayush975/zulip,PhilSk/zulip,susansls/zulip,vaidap/zulip,amanharitsh123/zulip,dattatreya303/zulip,aakash-cr7/zulip,timabbott/zulip,jphilipsen05/zulip,JPJPJPOPOP/zulip,timabbott/zulip,rishig/zulip,ryanbackman/zulip,kou/zulip,dattatreya303/zulip,hackerkid/zulip,rishig/zulip,kou/zulip,mahim97/zulip,rht/zulip,punchagan/zulip,sharmaeklavya2/zulip,eeshangarg/zulip,brockwhittaker/zulip,samatdav/zulip,j831/zulip,jphilipsen05/zulip,aakash-cr7/zulip,christi3k/zulip,jphilipsen05/zulip,tommyip/zulip,punchagan/zulip,vaidap/zulip,brockwhittaker/zulip,andersk/zulip,shubhamdhama/zulip,sharmaeklavya2/zulip,jrowan/zulip,rht/zulip,christi3k/zulip,sonali0901/zulip,sharmaeklavya2/zulip,brainwane/zulip,synicalsyntax/zulip,synicalsyntax/zulip,amanharitsh123/zulip,Galexrt/zulip,PhilSk/zulip,souravbadami/zulip,rht/zulip,vabs22/zulip,blaze225/zulip,PhilSk/zulip,dattatreya303/zulip,dhcrzf/zulip,rht/zulip,andersk/zulip,amanharitsh123/zulip,zulip/zulip,shubhamdhama/zulip,j831/zulip,mahim97/zulip,ryanbackman/zulip,samatdav/zulip,jackrzhang/zulip,JPJPJPOPOP/zulip,amanharitsh123/zulip,Galexrt/zulip,synicalsyntax/zulip,kou/zulip,souravbadami/zulip,SmartPeople/zulip,timabbott/zulip,hackerkid/zulip,samatdav/zulip,andersk/zulip,vabs22/zulip,mahim97/zulip,dhcrzf/zulip,JPJPJPOPOP/zulip,kou/zulip,showell/zulip,vaidap/zulip,jrowan/zulip,jackrzhang/zulip,aakash-cr7/zulip,timabbott/zulip,j831/zulip,sonali0901/zulip,eeshangarg/zulip,punchagan/zulip,blaze225/zulip,JPJPJPOPOP/zulip,ryanbackman/zulip,vabs22/zulip,jackrzhang/zulip,dawran6/zulip,sharmaeklavya2/zulip,rishig/zulip,timabbott/zulip,vaidap/zulip,andersk/zulip,samatdav/zulip,verma-varsha/zulip,tommyip/zulip,punchagan/zulip,jainayush975/zulip,sharmaeklavya2/zulip,aakash-cr7/zulip,dawran6/zulip,jainayush975/zulip,brockwhittaker/zulip,zulip/zulip,PhilSk/zulip,jrowan/zulip,brainwane/zulip,jrowan/zulip,mahim97/zulip,brainwane/zulip,showell/zulip,sonali0901/zulip,susansls/zulip,vaidap/zulip,susansls/zulip,synicalsyntax/zulip,tommyip/zulip,sonali0901/zulip,SmartPeople/zulip,hackerkid/zulip,aakash-cr7/zulip,kou/zulip,SmartPeople/zulip,Galexrt/zulip,aakash-cr7/zulip,andersk/zulip,hackerkid/zulip,sharmaeklavya2/zulip,jackrzhang/zulip,souravbadami/zulip,kou/zulip,sonali0901/zulip,brainwane/zulip,amanharitsh123/zulip,zulip/zulip,showell/zulip,mahim97/zulip,jainayush975/zulip,synicalsyntax/zulip,samatdav/zulip,dhcrzf/zulip,jackrzhang/zulip,jrowan/zulip,PhilSk/zulip,blaze225/zulip,jainayush975/zulip,souravbadami/zulip,tommyip/zulip,ryanbackman/zulip,ryanbackman/zulip,susansls/zulip,sonali0901/zulip,rishig/zulip,amanharitsh123/zulip,hackerkid/zulip,souravbadami/zulip,dawran6/zulip,eeshangarg/zulip,eeshangarg/zulip,christi3k/zulip,showell/zulip,jainayush975/zulip,brainwane/zulip,mahim97/zulip,SmartPeople/zulip,dattatreya303/zulip,jphilipsen05/zulip,dawran6/zulip,showell/zulip,andersk/zulip,verma-varsha/zulip,showell/zulip,dhcrzf/zulip,punchagan/zulip,eeshangarg/zulip,brockwhittaker/zulip,zulip/zulip,jphilipsen05/zulip,shubhamdhama/zulip,eeshangarg/zulip,Galexrt/zulip,souravbadami/zulip,verma-varsha/zulip,tommyip/zulip,dattatreya303/zulip,rishig/zulip,jrowan/zulip,rht/zulip,vabs22/zulip,kou/zulip,dhcrzf/zulip,tommyip/zulip,timabbott/zulip,jackrzhang/zulip,dawran6/zulip,rishig/zulip,shubhamdhama/zulip,brockwhittaker/zulip,verma-varsha/zulip,Galexrt/zulip,zulip/zulip,j831/zulip,hackerkid/zulip,punchagan/zulip,JPJPJPOPOP/zulip,rishig/zulip,jackrzhang/zulip,blaze225/zulip,ryanbackman/zulip,SmartPeople/zulip,tommyip/zulip,samatdav/zulip,Galexrt/zulip,andersk/zulip,susansls/zulip,eeshangarg/zulip,synicalsyntax/zulip,shubhamdhama/zulip,christi3k/zulip,punchagan/zulip,dawran6/zulip,verma-varsha/zulip,brainwane/zulip,zulip/zulip