install docs: Fix some small grammar and orthography issues.
install docs: Fix some small grammar and orthography issues.

After editing this file for the previous commit, I couldn't unsee
"low-traffic the".  So I fixed that, saw more issues, and then just
went through the page for everything that was similarly trivial to fix.

timabbott/zulip,timabbott/zulip,verma-varsha/zulip,brockwhittaker/zulip,kou/zulip,zulip/zulip,timabbott/zulip,synicalsyntax/zulip,hackerkid/zulip,showell/zulip,vaidap/zulip,jackrzhang/zulip,timabbott/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,Galexrt/zulip,dhcrzf/zulip,shubhamdhama/zulip,mahim97/zulip,punchagan/zulip,amanharitsh123/zulip,synicalsyntax/zulip,andersk/zulip,vabs22/zulip,zulip/zulip,zulip/zulip,shubhamdhama/zulip,zulip/zulip,hackerkid/zulip,mahim97/zulip,andersk/zulip,synicalsyntax/zulip,tommyip/zulip,shubhamdhama/zulip,jackrzhang/zulip,Galexrt/zulip,amanharitsh123/zulip,brainwane/zulip,mahim97/zulip,hackerkid/zulip,zulip/zulip,amanharitsh123/zulip,tommyip/zulip,vabs22/zulip,eeshangarg/zulip,timabbott/zulip,vabs22/zulip,rishig/zulip,dhcrzf/zulip,jackrzhang/zulip,hackerkid/zulip,rht/zulip,Galexrt/zulip,jackrzhang/zulip,rht/zulip,verma-varsha/zulip,hackerkid/zulip,Galexrt/zulip,andersk/zulip,eeshangarg/zulip,showell/zulip,rht/zulip,punchagan/zulip,rishig/zulip,showell/zulip,verma-varsha/zulip,eeshangarg/zulip,vaidap/zulip,brockwhittaker/zulip,showell/zulip,vaidap/zulip,punchagan/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip,Galexrt/zulip,verma-varsha/zulip,tommyip/zulip,rht/zulip,punchagan/zulip,rishig/zulip,rishig/zulip,brainwane/zulip,rishig/zulip,synicalsyntax/zulip,vabs22/zulip,tommyip/zulip,punchagan/zulip,dhcrzf/zulip,brainwane/zulip,jackrzhang/zulip,dhcrzf/zulip,rishig/zulip,vaidap/zulip,mahim97/zulip,kou/zulip,tommyip/zulip,dhcrzf/zulip,shubhamdhama/zulip,amanharitsh123/zulip,synicalsyntax/zulip,punchagan/zulip,verma-varsha/zulip,amanharitsh123/zulip,kou/zulip,timabbott/zulip,vaidap/zulip,kou/zulip,shubhamdhama/zulip,dhcrzf/zulip,jackrzhang/zulip,tommyip/zulip,vaidap/zulip,brockwhittaker/zulip,hackerkid/zulip,eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,vabs22/zulip,andersk/zulip,andersk/zulip,kou/zulip,dhcrzf/zulip,andersk/zulip,amanharitsh123/zulip,brockwhittaker/zulip,brainwane/zulip,kou/zulip,timabbott/zulip,brainwane/zulip,kou/zulip,synicalsyntax/zulip,brainwane/zulip,showell/zulip,zulip/zulip,brockwhittaker/zulip,jackrzhang/zulip,mahim97/zulip,rht/zulip,verma-varsha/zulip,tommyip/zulip,brockwhittaker/zulip,mahim97/zulip,showell/zulip,Galexrt/zulip,rht/zulip,rishig/zulip,showell/zulip,eeshangarg/zulip,synicalsyntax/zulip,vabs22/zulip,zulip/zulip,Galexrt/zulip,rht/zulip