api: Fix feature level 107 in the API change log.
api: Fix feature level 107 in the API change log.

Addes a new line between feature level 107 and its content so that said
content renders correctly as an unordered list item.

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