Better clarify announcements notification setting
As noted here: https://gitlab.com/gitlab-org/gitter/webapp/issues/2456 https://gitlab.com/gitlab-org/gitter/webapp/issues/1205
"Unread item counts" is tied to the setting for 'mentions and announcements', which means that all unread messages will eventually trigger emails to be sent. This fixes that bug by conveying to the user that they are going to get emails in both cases: either immediately, or in batches.
Edited by Eric Eastwood