help: Mention default emoji set in emoji-and-emoticons.md.
help: Mention default emoji set in emoji-and-emoticons.md.

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