test_user_groups: Fix comment in test_user_group_create.
test_user_groups: Fix comment in test_user_group_create.

kou/zulip,eeshangarg/zulip,andersk/zulip,andersk/zulip,zulip/zulip,rht/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,kou/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,kou/zulip,andersk/zulip,andersk/zulip,rht/zulip,zulip/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,andersk/zulip