user docs: Fix spelling of macOS in desktop install guide.
user docs: Fix spelling of macOS in desktop install guide.

timabbott/zulip,rishig/zulip,brainwane/zulip,hackerkid/zulip,synicalsyntax/zulip,shubhamdhama/zulip,showell/zulip,andersk/zulip,timabbott/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,showell/zulip,jackrzhang/zulip,zulip/zulip,jackrzhang/zulip,kou/zulip,zulip/zulip,shubhamdhama/zulip,eeshangarg/zulip,synicalsyntax/zulip,punchagan/zulip,hackerkid/zulip,showell/zulip,hackerkid/zulip,zulip/zulip,jackrzhang/zulip,rht/zulip,brainwane/zulip,rht/zulip,jackrzhang/zulip,hackerkid/zulip,punchagan/zulip,hackerkid/zulip,punchagan/zulip,synicalsyntax/zulip,synicalsyntax/zulip,kou/zulip,rishig/zulip,rishig/zulip,eeshangarg/zulip,tommyip/zulip,dhcrzf/zulip,dhcrzf/zulip,tommyip/zulip,tommyip/zulip,rht/zulip,timabbott/zulip,andersk/zulip,zulip/zulip,shubhamdhama/zulip,dhcrzf/zulip,brainwane/zulip,dhcrzf/zulip,zulip/zulip,timabbott/zulip,tommyip/zulip,rht/zulip,eeshangarg/zulip,shubhamdhama/zulip,tommyip/zulip,rishig/zulip,kou/zulip,rht/zulip,rishig/zulip,tommyip/zulip,jackrzhang/zulip,kou/zulip,showell/zulip,rishig/zulip,showell/zulip,shubhamdhama/zulip,andersk/zulip,hackerkid/zulip,shubhamdhama/zulip,eeshangarg/zulip,timabbott/zulip,jackrzhang/zulip,synicalsyntax/zulip,jackrzhang/zulip,brainwane/zulip,brainwane/zulip,rht/zulip,kou/zulip,kou/zulip,shubhamdhama/zulip,showell/zulip,punchagan/zulip,kou/zulip,brainwane/zulip,punchagan/zulip,zulip/zulip,punchagan/zulip,timabbott/zulip,andersk/zulip,zulip/zulip,synicalsyntax/zulip,showell/zulip,hackerkid/zulip,andersk/zulip,synicalsyntax/zulip,rishig/zulip,dhcrzf/zulip,andersk/zulip,timabbott/zulip,eeshangarg/zulip,punchagan/zulip,dhcrzf/zulip,tommyip/zulip,andersk/zulip,dhcrzf/zulip,brainwane/zulip