integrations-docs: Add line break in GitLab integration doc.
integrations-docs: Add line break in GitLab integration doc.

rht/zulip,rht/zulip,zulip/zulip,andersk/zulip,andersk/zulip,zulip/zulip,andersk/zulip,andersk/zulip,zulip/zulip,zulip/zulip,rht/zulip,rht/zulip,andersk/zulip,rht/zulip,andersk/zulip,rht/zulip,zulip/zulip,zulip/zulip,zulip/zulip,andersk/zulip,rht/zulip