api docs: Fix syntax for get-user-groups.
api docs: Fix syntax for get-user-groups.

This apparently had some sort of rebase conflict issue with the
migration to the nicer syntax for tabs.

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