docs: Remove unnecessary double-backticks in indented line.
docs: Remove unnecessary double-backticks in indented line.

These came in during the conversion from rST in 337155f280.
zulip/zulip,rht/zulip,timabbott/zulip,synicalsyntax/zulip,rht/zulip,timabbott/zulip,punchagan/zulip,synicalsyntax/zulip,zulip/zulip,andersk/zulip,kou/zulip,synicalsyntax/zulip,punchagan/zulip,timabbott/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,showell/zulip,brainwane/zulip,andersk/zulip,zulip/zulip,shubhamdhama/zulip,eeshangarg/zulip,hackerkid/zulip,rht/zulip,timabbott/zulip,showell/zulip,andersk/zulip,kou/zulip,punchagan/zulip,hackerkid/zulip,rht/zulip,andersk/zulip,shubhamdhama/zulip,eeshangarg/zulip,showell/zulip,hackerkid/zulip,kou/zulip,shubhamdhama/zulip,timabbott/zulip,hackerkid/zulip,punchagan/zulip,synicalsyntax/zulip,eeshangarg/zulip,timabbott/zulip,zulip/zulip,showell/zulip,showell/zulip,kou/zulip,showell/zulip,hackerkid/zulip,shubhamdhama/zulip,kou/zulip,brainwane/zulip,synicalsyntax/zulip,shubhamdhama/zulip,showell/zulip,shubhamdhama/zulip,kou/zulip,timabbott/zulip,brainwane/zulip,eeshangarg/zulip,brainwane/zulip,brainwane/zulip,eeshangarg/zulip,rht/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,rht/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,synicalsyntax/zulip,andersk/zulip,brainwane/zulip,andersk/zulip,hackerkid/zulip,synicalsyntax/zulip,punchagan/zulip,shubhamdhama/zulip,punchagan/zulip,brainwane/zulip