docs: Improve discussion of GitHub area teams.
docs: Improve discussion of GitHub area teams.

The content in that paragraph had been written when GSoC was mainly
zulip/zulip.

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