settings: Add help link with user read receipts setting.
settings: Add help link with user read receipts setting.

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