docs(notifications): remove old documentation for default email recipient

Author: sarahhodne

user/notifications.md

@@ -15,11 +15,6 @@ author, if they are members of the repository (that is, they have push or admin
 permissions for public repositories, or if they have pull, push or admin
 permissions for private repositories).
 
-By default it will send emails to
-
-* the committer and author, if they are members of the repository
-* the committer and author, if they are also members of the repository, if the build occurs on a non-default branch
-
 And it will by default send emails when, on the given branch:
 
 * a build was just broken or still is broken