replace universal email notice setting with a comment on how to produce a specific one

BuildParams

@@ -161,8 +161,8 @@ viewer-development.login_channel = "Second Life Beta Development"
 viewer-development.viewer_grid = agni
 viewer-development.build_viewer_update_version_manager = false
 
-# Notifications
-viewer-development.email = oz@lindenlab.com
+# Notifications - to configure email notices, add a setting like this:
+# <username>_<reponame>.email = <email-address>
 
 # =======================================
 # brad